{"id":105871,"date":"2023-07-24T00:00:00","date_gmt":"2023-07-24T00:00:00","guid":{"rendered":"https:\/\/docosan-blog.local\/blog\/uncategorized\/cach-tinh-do-can-thi-cua-mat\/"},"modified":"2026-02-28T21:44:00","modified_gmt":"2026-02-28T14:44:00","slug":"cach-tinh-do-can-thi-cua-mat","status":"publish","type":"post","link":"https:\/\/www.docosan.com\/blog\/mat\/cach-tinh-do-can-thi-cua-mat\/","title":{"rendered":"Top 4 c\u00e1ch t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft chu\u1ea9n"},"content":{"rendered":"<p><a href=\"https:\/\/www.docosan.com\/blog\/mat\/can-thi\/\" target=\"_blank\" rel=\"noreferrer noopener\">C\u1eadn th\u1ecb<\/a>, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Myopia ho\u1eb7c Nearsightedness trong ti\u1ebfng Anh, l\u00e0 t\u00ecnh tr\u1ea1ng kh\u00fac x\u1ea1 ph\u1ed5 bi\u1ebfn nh\u1ea5t \u1edf m\u1eaft, v\u00e0 \u0111ang tr\u1edf n\u00ean ng\u00e0y c\u00e0ng ph\u1ed5 bi\u1ebfn, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi h\u1ecdc sinh v\u00e0 ng\u01b0\u1eddi lao \u0111\u1ed9ng tr\u1ebb. C\u1eadn th\u1ecb khi\u1ebfn ch\u00fang ta ch\u1ec9 c\u00f3 th\u1ec3 nh\u00ecn r\u00f5 nh\u1eefng v\u1eadt \u1edf g\u1ea7n, trong khi \u0111\u1ed1i di\u1ec7n v\u1edbi nh\u1eefng v\u1eadt \u1edf xa th\u00ec h\u00ecnh \u1ea3nh tr\u1edf n\u00ean m\u1edd \u0111i. \u0110\u1ec3 ki\u1ec3m tra xem b\u1ea1n c\u00f3 b\u1ecb c\u1eadn th\u1ecb hay kh\u00f4ng, c\u00f3 m\u1ed9t s\u1ed1 c\u00e1ch t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\"><strong>C\u00e1c c\u00e1ch \u0111o \u0111\u1ed9 c\u1eadn th\u1ecb ph\u1ed5 bi\u1ebfn hi\u1ec7n nay<\/strong><\/h2>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>\u0110o b\u1eb1ng m\u00e1y \u0111i\u1ec7n t\u1eed: <\/strong>\u0110\u00e2y l\u00e0 c\u00e1ch \u0111o \u0111\u1ed9 c\u1eadn th\u1ecb ch\u00ednh x\u00e1c nh\u1ea5t v\u00e0 ch\u1ec9 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n t\u1ea1i ph\u00f2ng kh\u00e1m ho\u1eb7c b\u1ec7nh vi\u1ec7n, do b\u00e1c s\u0129 chuy\u00ean khoa th\u1ef1c hi\u1ec7n.<\/li>\r\n\r\n\r\n\r\n<li><strong>B\u1ea3ng ch\u1eef c\u00e1i c\u1eadn th\u1ecb:<\/strong> \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra th\u00f4ng d\u1ee5ng, s\u1eed d\u1ee5ng c\u00e1c b\u1ea3ng ch\u1eef c\u00e1i nh\u01b0 Landolt, Snellen, Armaignac, Parinaud v\u00e0 c\u00e1c h\u00ecnh v\u1ebd. \u0110\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i c\u00e1c ph\u00f2ng kh\u00e1m v\u00e0 b\u1ec7nh vi\u1ec7n.<\/li>\r\n\r\n\r\n\r\n<li><strong>\u0110o b\u1eb1ng app online:<\/strong> \u0110\u00e2y l\u00e0 c\u00e1ch \u0111o ti\u1ec7n l\u1ee3i, h\u1ed7 tr\u1ee3 ki\u1ec3m tra nhi\u1ec1u lo\u1ea1i t\u1eadt kh\u00fac x\u1ea1 th\u00f4ng qua \u1ee9ng d\u1ee5ng tr\u00ean \u0111i\u1ec7n tho\u1ea1i. C\u00f3 nhi\u1ec1u app ph\u1ed5 bi\u1ebfn nh\u01b0 Prescription Check, Eye Care Plus, iCare Eye Test, Eye exam,&#8230;<\/li>\r\n\r\n\r\n\r\n<li><strong>\u0110o \u0111\u1ed9 c\u1eadn t\u1ea1i nh\u00e0:<\/strong> S\u1eed d\u1ee5ng c\u00e1c d\u1ee5ng c\u1ee5 \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111i\u1ec3m nh\u00ecn c\u1eadn v\u00e0 vi\u1ec5n c\u1ee7a m\u1eaft. Tuy nhi\u00ean, k\u1ebft qu\u1ea3 \u0111o kh\u00f4ng \u0111\u1ea1t \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Trong 4 c\u00e1ch tr\u00ean, c\u00e1ch \u0111o \u0111\u1ed9 c\u1eadn th\u1ecb b\u1eb1ng b\u1ea3ng ch\u1eef c\u00e1i, b\u1eb1ng app online, v\u00e0 b\u1eb1ng c\u00e1c d\u1ee5ng c\u1ee5 \u0111\u01a1n gi\u1ea3n l\u00e0 nh\u1eefng c\u00e1ch c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n t\u1ea1i nh\u00e0. Tuy nhi\u00ean c\u00e1c ph\u01b0\u01a1ng ph\u00e1p n\u00e0y cho k\u1ebft c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c kh\u00f4ng tuy\u1ec7t \u0111\u1ed1i, v\u00ec v\u1eady b\u1ea1n n\u00ean <a href=\"https:\/\/www.docosan.com\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>\u0111\u1eb7t l\u1ecbch kh\u00e1m<\/strong><\/a> ho\u1eb7c \u0111\u1ebfn c\u01a1 s\u1edf y t\u1ebf g\u1ea7n nh\u1ea5t \u0111\u1ec3 ki\u1ec3m.\u00a0<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-82107\" src=\"https:\/\/www.docosan.com\/blog\/wp-content\/uploads\/2023\/07\/Cach-tinh-do-can-thi-cua-mat-chuan-5.jpg\" alt=\"c\u00e1ch \u0111o \u0111\u1ed9 c\u1eadn th\u1ecb b\u1eb1ng b\u1ea3ng ch\u1eef c\u00e1i, b\u1eb1ng app online, v\u00e0 b\u1eb1ng c\u00e1c d\u1ee5ng c\u1ee5 \u0111\u01a1n gi\u1ea3n\" \/>\r\n<figcaption class=\"wp-element-caption\">C\u00e1ch t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft \u0111\u01a1n gi\u1ea3n b\u1eb1ng b\u1ea3ng ch\u1eef c\u00e1i, b\u1eb1ng app online, v\u00e0 b\u1eb1ng c\u00e1c d\u1ee5ng c\u1ee5<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\"><strong>C\u00e1ch t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft<\/strong><\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">C\u00e1ch \u0111o \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft th\u00f4ng d\u1ee5ng nh\u1ea5t l\u00e0 d\u1ef1a v\u00e0o b\u1ea3ng \u0111o. Ng\u01b0\u1eddi c\u1ea7n \u0111o m\u1eaft s\u1ebd ng\u1ed3i tr\u01b0\u1edbc b\u1ea3ng \u0111o c\u00e1ch m\u1ed9t kho\u1ea3ng nh\u1ea5t \u0111\u1ecbnh, sau \u0111\u00f3 m\u1ed9t ng\u01b0\u1eddi ch\u1ec9 v\u00e0o b\u1ea3ng, ng\u01b0\u1eddi c\u1ea7n \u0111o s\u1ebd che m\u1ed9t b\u00ean m\u1eaft (l\u1ea7n l\u01b0\u1ee3t 2 b\u00ean), r\u1ed3i \u0111\u1ecdc c\u00e1c k\u00fd t\u1ef1 tr\u00ean b\u1ea3ng theo y\u00eau c\u1ea7u c\u1ee7a ng\u01b0\u1eddi ch\u1ec9 d\u1eabn.\u00a0<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">C\u00f3 nhi\u1ec1u b\u1ea3ng \u0111o th\u1ecb l\u1ef1c c\u1ee7a m\u1eaft, t\u00f9y v\u00e0o t\u1eebng \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee5 th\u1ec3 m\u00e0 \u00e1p d\u1ee5ng c\u00e1ch t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb v\u1edbi nh\u1eefng b\u1ea3ng \u0111o kh\u00e1c nhau. C\u00f3 c\u00e1c lo\u1ea1i b\u1ea3ng \u0111o nh\u01b0 sau:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>B\u1ea3ng th\u1ecb l\u1ef1c v\u00f2ng tr\u00f2n h\u1edf LandoIt<\/li>\r\n\r\n\r\n\r\n<li>B\u1ea3ng th\u1ecb l\u1ef1c b\u1eb1ng ch\u1eef c\u00e1i c\u1ee7a Snellen v\u1edbi nh\u1eefng ch\u1eef c\u00e1i: L F D O I E<\/li>\r\n\r\n\r\n\r\n<li>B\u1ea3ng th\u1ecb l\u1ef1c ch\u1eef E c\u1ee7a Armaignac<\/li>\r\n\r\n\r\n\r\n<li>B\u1ea3ng th\u1ecb l\u1ef1c h\u00ecnh v\u1edbi c\u00e1c lo\u1ea1i h\u00ecnh \u0111\u1ed3 v\u1eadt\/con v\u1eadt d\u00f9ng cho tr\u1ebb em ho\u1eb7c cho nh\u1eefng ng\u01b0\u1eddi kh\u00f4ng bi\u1ebft ch\u1eef<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1eadn th\u1ecb \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh d\u1ef1a v\u00e0o \u0111i\u1ec3m c\u1ef1c c\u1eadn v\u00e0 \u0111i\u1ec3m c\u1ef1c vi\u1ec5n c\u1ee7a ng\u01b0\u1eddi b\u1ec7nh, m\u1eaft s\u1ebd nh\u00ecn th\u1ea5y r\u00f5 khi h\u00ecnh \u1ea3nh n\u1eb1m trong gi\u1edbi h\u1ea1n c\u1ee7a 2 \u0111i\u1ec3m n\u00e0y. Ng\u01b0\u1eddi kh\u00f4ng b\u1ecb c\u1eadn, c\u00f3 \u0111i\u1ec3m c\u1ef1c vi\u1ec5n l\u00e0 v\u00f4 c\u1ef1c. Do \u0111\u00f3, ng\u01b0\u1eddi b\u1ecb c\u1eadn th\u1ecb s\u1ebd \u0111eo k\u00ednh \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec3m c\u1ef1c vi\u1ec5n v\u1ec1 v\u00f4 c\u1ef1c nh\u01b0 ng\u01b0\u1eddi b\u00ecnh th\u01b0\u1eddng.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>S\u1ef1 t\u01b0\u01a1ng quan gi\u1eefa \u0111\u1ed9 c\u1eadn v\u00e0 \u0111i\u1ec3m c\u1ef1c vi\u1ec5n nh\u01b0 sau:<\/strong><\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>\u0110i\u1ec3m c\u1ef1c vi\u1ec5n 2m t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi m\u1ee9c c\u1eadn kho\u1ea3ng -1 \u0111i-\u1ed1p.<\/li>\r\n\r\n\r\n\r\n<li>\u0110i\u1ec3m c\u1ef1c vi\u1ec5n 1m m\u1ee9c \u0111\u1ed9 c\u1eadn kho\u1ea3ng -1.5 \u0111i-\u1ed1p.\u00a0\u00a0<\/li>\r\n\r\n\r\n\r\n<li>\u0110i\u1ec3m c\u1ef1c vi\u1ec5n 0.5m m\u1ee9c \u0111\u1ed9 c\u1eadn th\u1ecb kho\u1ea3ng -2 \u0111i-\u1ed1p.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb khi \u0111o t\u1ea1i nh\u00e0<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>\u0110\u1ed9 c\u1eadn = 100\/ kho\u1ea3ng c\u00e1ch nh\u00ecn r\u00f5 (cm)<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">C\u00f4ng th\u1ee9c n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi \u0111o \u0111\u1ed9 c\u1eadn t\u1ea1i nh\u00e0.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5: Kho\u1ea3ng c\u00e1ch nh\u00ecn r\u00f5 l\u00e0 50 cm th\u00ec \u0111\u1ed9 c\u1eadn s\u1ebd \u0111\u01b0\u1ee3c t\u00ednh l\u00e0: 100\/50 = 2 \u0111\u1ed9.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>C\u00e1ch quy \u0111\u1ed5i \u0111\u1ed9 c\u1eadn th\u1ecb<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Khi \u0111o m\u1eaft, b\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c nghe nh\u1eefng thu\u1eadt ng\u1eef nh\u01b0 th\u1ecb l\u1ef1c 10\/10, 8\/10, 5\/10 hay 3\/10. \u0110\u00f3 l\u00e0 c\u00e1ch ghi k\u1ebft qu\u1ea3 khi \u0111o th\u1ecb l\u1ef1c b\u1eb1ng b\u1ea3ng ch\u1eef c\u00e1i, cho bi\u1ebft b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c bao nhi\u00eau h\u00e0ng tr\u00ean t\u1ed5ng 10 h\u00e0ng.\u00a0<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><em>V\u00ed d\u1ee5: khi \u0111o \u0111\u1ed9 c\u1eadn th\u1ecb b\u1eb1ng b\u1ea3ng ch\u1eef c\u00e1i, b\u1ea1n \u0111\u1ecdc \u0111\u01b0\u1ee3c 5 h\u00e0ng th\u00ec th\u1ecb l\u1ef1c c\u1ee7a b\u1ea1n l\u00e0 5\/10, b\u1ea1n \u0111\u1ecdc \u0111\u01b0\u1ee3c 8 h\u00e0ng th\u00ec th\u1ecb l\u1ef1c c\u1ee7a b\u1ea1n l\u00e0 8\/10.<\/em><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>\u0110\u1ed9 c\u1eadn th\u1ecb s\u1ebd t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t kho\u1ea3ng th\u1ecb l\u1ef1c c\u1ee5 th\u1ec3, v\u00e0 c\u00e1ch quy \u0111\u1ed5i nh\u01b0 sau:<\/strong><\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Th\u1ecb l\u1ef1c 1\/10 = 1 \/ 1\/10 = 10 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 2\/10 = 1 \/ 2\/10 = 5 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 3\/10 = 1 \/ 3\/10 \u2248 3.33 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 4\/10 = 1 \/ 4\/10 = 2.5 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 5\/10 = 1 \/ 5\/10 = 2 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 6\/10 = 1 \/ 6\/10 \u2248 1.67 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 7\/10 = 1 \/ 7\/10 \u2248 1.43 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 8\/10 = 1 \/ 8\/10 = 1.25 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 9\/10 = 1 \/ 9\/10 \u2248 1.11 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 10\/10 = 1 \/ 10\/10 = 1 D (Th\u1ecb l\u1ef1c b\u00ecnh th\u01b0\u1eddng)<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 20\/25 = 1 \/ 20\/25 = 1.25 D<\/li>\r\n\r\n\r\n\r\n<li>Th\u1ecb l\u1ef1c 20\/50 = 1 \/ 20\/50 = 0.5 D<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Trong tr\u01b0\u1eddng h\u1ee3p th\u1ecb l\u1ef1c \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng c\u00e1ch vi\u1ebft d\u01b0\u1edbi d\u1ea1ng fraction (t\u1ef7 l\u1ec7), b\u1ea1n c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed5i n\u00f3 sang \u0111\u01a1n v\u1ecb diop b\u1eb1ng c\u00e1ch l\u1ea5y ngh\u1ecbch \u0111\u1ea3o c\u1ee7a gi\u00e1 tr\u1ecb th\u1ecb l\u1ef1c. N\u1ebfu th\u1ecb l\u1ef1c \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng c\u00e1c s\u1ed1 th\u1eadp ph\u00e2n, th\u00ec b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c tr\u00ean \u0111\u1ec3 t\u00ednh to\u00e1n.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>C\u00e1c m\u1ee9c \u0111\u1ed9 c\u1eadn th\u1ecb<\/strong><\/h3>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>C\u1eadn th\u1ecb nh\u1eb9: &lt; -3.00D<\/li>\r\n\r\n\r\n\r\n<li>C\u1eadn th\u1ecb trung b\u00ecnh: -3.00 \u0111\u1ebfn -6.00D<\/li>\r\n\r\n\r\n\r\n<li>C\u1eadn th\u1ecb n\u1eb7ng: &gt; -6.00D<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\"><strong>H\u01b0\u1edbng d\u1eabn \u0111o \u0111\u1ed9 c\u1eadn b\u1eb1ng d\u1ee5ng c\u1ee5 \u0111\u01a1n gi\u1ea3n t\u1ea1i nh\u00e0<\/strong><\/h2>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>D\u1ee5ng c\u1ee5 c\u1ea7n thi\u1ebft<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">C\u1ea7n chu\u1ea9n b\u1ecb c\u00e1c d\u1ee5ng c\u1ee5 sau: b\u1ea3ng \u0111o th\u1ecb l\u1ef1c, 1 c\u00e2y th\u01b0\u1edbc \u0111\u01a1n v\u1ecb cm, 1 s\u1ee3i d\u00e2y tr\u1eafng d\u00e0i 105-110cm, 2 c\u00e2y vi\u1ebft m\u00e0u m\u1ef1c kh\u00e1c nhau, 1 b\u00eca gi\u1ea5y c\u1ee9ng in ch\u1eef b\u1ea5t k\u00ec kh\u00f4ng d\u1ea5u (ph\u00f4ng ch\u1eef Times New Roman, c\u1ee1 ch\u1eef 14, in \u0111\u1eadm) v\u00e0 ph\u1ea3i c\u00f3 2 ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n ph\u00e9p \u0111o.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>C\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n\u00a0<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 1:<\/strong> Ng\u01b0\u1eddi \u0111\u01b0\u1ee3c \u0111o d\u00f9ng m\u1ed9t tay che m\u1eaft l\u1ea1i, tay c\u00f2n l\u1ea1i c\u1ea7m l\u1ea5y m\u1ed9t s\u1ee3i d\u00e2y \u0111\u1eb7t d\u01b0\u1edbi m\u1eaft c\u1ea7n \u0111o, \u0111\u1eb7t \u1edf v\u1ecb tr\u00ed ngang b\u1eb1ng v\u1edbi m\u0169i v\u00e0 c\u00e1ch m\u0169i 1cm.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 2<\/strong>: Ng\u01b0\u1eddi h\u1ed7 tr\u1ee3 d\u00f9ng m\u1ed9t tay c\u0103ng d\u00e2y, tay c\u00f2n l\u1ea1i c\u1ea7m b\u00eca gi\u1ea5y di chuy\u1ec3n t\u1eeb s\u00e1t m\u1eaft ra xa ch\u1ea7m ch\u1eadm tr\u00ean s\u1ee3i d\u00e2y \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111i\u1ec3m c\u1ef1c c\u1eadn v\u00e0 \u0111i\u1ec3m c\u1ef1c vi\u1ec5n c\u1ee7a m\u1eaft ng\u01b0\u1eddi c\u1ea7n \u0111o. Khi k\u00e9o b\u00eca gi\u1ea5y t\u1eeb t\u1eeb ra xa, y\u00eau c\u1ea7u ng\u01b0\u1eddi \u0111\u01b0\u1ee3c \u0111o \u0111\u1ecdc ch\u1eef tr\u00ean gi\u1ea5y, r\u1ed3i x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch xa nh\u1ea5t m\u00e0 ng\u01b0\u1eddi \u0111\u00f3 c\u00f3 th\u1ec3 th\u1ea5y r\u00f5 l\u00e0 v\u1ecb tr\u00ed n\u00e0o, \u0111\u00e1nh d\u1ea5u l\u1ea1i.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 3:<\/strong> Cho ng\u01b0\u1eddi c\u1ea7n \u0111o th\u01b0 gi\u00e3n 3 ph\u00fat r\u1ed3i th\u1ef1c hi\u1ec7n l\u1ea1i c\u00e1c b\u01b0\u1edbc t\u01b0\u01a1ng t\u1ef1 cho m\u1eaft b\u00ean kia.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>C\u00e1ch t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft:<\/strong><\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>L\u1ea5y th\u01b0\u1edbc \u0111o kho\u1ea3ng c\u00e1ch t\u1eeb \u0111\u1ea7u s\u1ee3i d\u00e2y \u0111\u1ebfn \u0111i\u1ec3m \u0111\u00e1nh d\u1ea5u c\u1ee7a 2 m\u1eaft, \u0111\u01a1n v\u1ecb l\u00e0 centimet. L\u1ea5y 100 chia cho kho\u1ea3ng c\u00e1ch v\u1eeba \u0111o \u0111\u01b0\u1ee3c s\u1ebd cho ra k\u1ebft qu\u1ea3 \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft.<\/li>\r\n\r\n\r\n\r\n<li>\u0110\u1ed9 c\u1eadn = 100\/ kho\u1ea3ng c\u00e1ch (cm). V\u00ed d\u1ee5: Kho\u1ea3ng c\u00e1ch nh\u00ecn r\u00f5 l\u00e0 60cm th\u00ec \u0111\u1ed9 c\u1eadn = 100\/60= 1.67 \u0111\u1ed9. C\u1ea7n ch\u00fa \u00fd th\u1ef1c hi\u1ec7n ph\u00e9p \u0111o n\u00e0y \u1edf n\u01a1i \u0111\u1ee7 s\u00e1ng, nh\u1ea5t l\u00e0 v\u00e0o ban ng\u00e0y<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Theo ph\u01b0\u01a1ng ph\u00e1p \u0111o b\u1eb1ng d\u1ee5ng c\u1ee5 \u0111\u01a1n gi\u1ea3n n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1ed9 c\u1eadn th\u1ecb ngay t\u1ea1i nh\u00e0 nh\u01b0ng l\u1ea1i ch\u1ec9 cho k\u1ebft qu\u1ea3 c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c tuy\u1ec7t \u0111\u1ed1i. Mu\u1ed1n c\u00f3 k\u1ebft qu\u1ea3 \u0111\u1ed9 c\u1eadn th\u1ecb ch\u00ednh x\u00e1c h\u01a1n, b\u1ea1n n\u00ean \u0111\u1ebfn b\u1ec7nh vi\u1ec7n ho\u1eb7c ph\u00f2ng kh\u00e1m m\u1eaft \u0111\u1ec3 \u0111\u01b0\u1ee3c <strong><a href=\"https:\/\/www.docosan.com\/chuyen-khoa\/mat-s9\" target=\"_blank\" rel=\"noreferrer noopener\">b\u00e1c s\u0129 chuy\u00ean m\u00f4n m\u1eaft<\/a><\/strong> ki\u1ec3m tra, \u0111o th\u1ecb l\u1ef1c m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c v\u00e0 can thi\u1ec7p s\u1edbm \u0111\u1ed3ng th\u1eddi <a href=\"https:\/\/www.docosan.com\/blog\/mat\/phuong-phap-khac-phuc-can-thi\/\" target=\"_blank\" rel=\"noreferrer noopener\">kh\u1eafc ph\u1ee5c c\u1eadn th\u1ecb<\/a> hi\u1ec7u qu\u1ea3.<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-82109\" src=\"https:\/\/www.docosan.com\/blog\/wp-content\/uploads\/2023\/07\/Cach-tinh-do-can-thi-cua-mat-chuan-1-1.jpg\" alt=\"n\u00ean \u0111\u1ebfn b\u1ec7nh vi\u1ec7n ho\u1eb7c ph\u00f2ng kh\u00e1m m\u1eaft \u0111\u1ec3 \u0111\u01b0\u1ee3c b\u00e1c s\u0129 chuy\u00ean m\u00f4n ki\u1ec3m tra\" \/>\r\n<figcaption class=\"wp-element-caption\">N\u00ean \u0111\u1ebfn b\u1ec7nh vi\u1ec7n ho\u1eb7c ph\u00f2ng kh\u00e1m m\u1eaft \u0111\u1ec3 \u0111\u01b0\u1ee3c b\u00e1c s\u0129 chuy\u00ean m\u00f4n ki\u1ec3m tra<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\"><strong>\u0110\u1ed9 c\u1eadn th\u1ecb l\u00e0 g\u00ec?\u00a0<\/strong><\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1eadn th\u1ecb l\u00e0 th\u00f4ng s\u1ed1 quan tr\u1ecdng d\u00f9ng \u0111\u1ec3 ch\u1ec9 m\u1ee9c \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft. B\u00e1c s\u0129 th\u01b0\u1eddng d\u1ef1a v\u00e0o \u0111\u1ed9 c\u1eadn th\u1ecb \u0111\u1ec3 \u0111\u01b0a ra bi\u1ec7n ph\u00e1p c\u1ea3i thi\u1ec7n th\u1ecb l\u1ef1c ph\u00f9 h\u1ee3p cho t\u1eebng \u0111\u1ed1i t\u01b0\u1ee3ng.\u00a0<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Diop l\u00e0 \u0111\u01a1n v\u1ecb \u0111o \u0111\u1ed9 cong c\u1ee7a th\u1ea5u k\u00ednh s\u1eed d\u1ee5ng gi\u00fap m\u1eaft c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y m\u1ecdi v\u1eadt nh\u01b0 b\u00ecnh th\u01b0\u1eddng. Gi\u00e1 tr\u1ecb Diop c\u00e0ng l\u1edbn th\u1ec3 hi\u1ec7n t\u00ecnh tr\u1ea1ng c\u1eadn th\u1ecb c\u00e0ng n\u1eb7ng v\u00e0 \u0111\u1ed9 d\u00e0y c\u1ee7a th\u1ea5u k\u00ednh s\u1eed d\u1ee5ng c\u00e0ng t\u0103ng.\u00a0<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>\u0110\u1ed9 c\u1eadn th\u1ecb k\u00ed hi\u1ec7u ch\u1eef D, \u0111\u1ecdc l\u00e0 \u0110i &#8211; \u1ed1p<\/li>\r\n\r\n\r\n\r\n<li>K\u00ed hi\u1ec7u ghi tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a th\u1ea5u k\u00ednh l\u00e0 &#8211; D c\u00f3 ngh\u0129a l\u00e0 t\u1eadt c\u1eadn th\u1ecb (n\u1ebfu tr\u00ean b\u1ec1 m\u1eb7t th\u1ea5u k\u00ednh ghi d\u1ea5u \u201c+\u201d l\u00e0 ch\u1ec9 t\u1eadt vi\u1ec5n th\u1ecb)<\/li>\r\n\r\n\r\n\r\n<li><em>V\u00ed d\u1ee5:<\/em><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><em>-1D t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1eadn th\u1ecb 1 \u0111\u1ed9<\/em><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><em>-2D t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1eadn th\u1ecb 2 \u0111\u1ed9\u00a0<\/em><\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-82105\" src=\"https:\/\/www.docosan.com\/blog\/wp-content\/uploads\/2023\/07\/Cach-tinh-do-can-thi-cua-mat-chuan-4.jpg\" alt=\"C\u00e1ch t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft S\u1ed1 hi\u1ec3n th\u1ecb tr\u00ean Diop t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi \u0111\u1ed9 c\u1eadn.\" \/>\r\n<figcaption class=\"wp-element-caption\"><em>S\u1ed1 hi\u1ec3n th\u1ecb tr\u00ean Diop t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi \u0111\u1ed9 c\u1eadn.<\/em><\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\"><strong>Ph\u00e2n lo\u1ea1i c\u1eadn th\u1ecb theo th\u1ec3 b\u1ec7nh<\/strong><\/h2>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">C\u1eadn th\u1ecb \u0111\u01a1n thu\u1ea7n (Simple Myopia)<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">C\u1eadn th\u1ecb \u0111\u01a1n thu\u1ea7n l\u00e0 lo\u1ea1i c\u1eadn th\u1ecb ph\u1ed5 bi\u1ebfn nh\u1ea5t so v\u1edbi c\u00e1c lo\u1ea1i c\u1eadn th\u1ecb kh\u00e1c. Khi b\u1ecb c\u1eadn th\u1ecb, th\u1ecb l\u1ef1c s\u1ebd gi\u1ea3m khi nh\u00ecn v\u00e0o xa, nh\u01b0ng v\u1eabn gi\u1eef nguy\u00ean kh\u1ea3 n\u0103ng nh\u00ecn r\u00f5 nh\u1eefng v\u1eadt \u1edf g\u1ea7n. Nguy\u00ean nh\u00e2n h\u00ecnh th\u00e0nh c\u1eadn th\u1ecb \u0111\u01a1n thu\u1ea7n l\u00e0 do s\u1ef1 kh\u00f4ng \u0111\u1ed1i x\u1ee9ng gi\u1eefa c\u00f4ng su\u1ea5t quang h\u1ecdc v\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a tr\u1ee5c tr\u01b0\u1edbc sau c\u1ee7a nh\u00e3n c\u1ea7u. Khi tr\u1ee5c tr\u01b0\u1edbc sau c\u1ee7a nh\u00e3n c\u1ea7u d\u00e0i h\u01a1n so v\u1edbi c\u00f4ng su\u1ea5t quang h\u1ecdc, t\u00ecnh tr\u1ea1ng c\u1eadn th\u1ecb s\u1ebd xu\u1ea5t hi\u1ec7n.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ch\u1ebf \u0111\u1ed9 sinh ho\u1ea1t v\u00e0 di truy\u1ec1n \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c g\u00e2y ra c\u1eadn th\u1ecb \u0111\u01a1n thu\u1ea7n. T\u00ecnh tr\u1ea1ng n\u00e0y th\u01b0\u1eddng ph\u00e1t tri\u1ec3n d\u1ea7n qua nhi\u1ec1u n\u0103m v\u00e0 sau \u0111\u00f3 d\u1eebng l\u1ea1i \u1edf m\u1ed9t m\u1ee9c \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh.<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-82106\" src=\"https:\/\/www.docosan.com\/blog\/wp-content\/uploads\/2023\/07\/Cach-tinh-do-can-thi-cua-mat-chuan-3.jpg\" alt=\"S\u1ef1 kh\u00e1c nhau v\u1ec1 quang h\u1ecdc c\u1ee7a m\u1eaft b\u00ecnh th\u01b0\u1eddng v\u00e0 m\u1eaft b\u1ecb c\u1eadn th\u1ecb\u00a0\" \/>\r\n<figcaption class=\"wp-element-caption\"><em>S\u1ef1 kh\u00e1c nhau v\u1ec1 quang h\u1ecdc c\u1ee7a m\u1eaft b\u00ecnh th\u01b0\u1eddng v\u00e0 m\u1eaft b\u1ecb c\u1eadn th\u1ecb<\/em>\u00a0<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">C\u1eadn th\u1ecb gi\u1ea3 (Pseudomyopia)<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">C\u1eadn th\u1ecb gi\u1ea3, hay c\u00f2n g\u1ecdi l\u00e0 c\u1eadn th\u1ecb t\u1ea1m th\u1eddi, x\u1ea3y ra khi m\u1eaft ph\u1ea3i l\u00e0m vi\u1ec7c trong th\u1eddi gian d\u00e0i, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u1eadp trung nh\u00ecn v\u00e0o c\u00e1c v\u1eadt \u1edf xa. Khi \u0111i\u1ec1u n\u00e0y x\u1ea3y ra, m\u1eaft kh\u00f4ng c\u00f2n th\u1ec3 hi\u1ec7u qu\u1ea3 trong vi\u1ec7c \u0111i\u1ec1u ti\u1ebft \u0111\u1ec3 nh\u00ecn r\u00f5 nh\u1eefng v\u1eadt xa, v\u00e0 k\u1ebft qu\u1ea3 l\u00e0 h\u00ecnh \u1ea3nh tr\u1edf n\u00ean m\u1edd \u0111i.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Vi\u1ec7c \u0111i\u1ec1u ti\u1ebft c\u1ee7a m\u1eaft ph\u1ee5 thu\u1ed9c v\u00e0o c\u01a1 ch\u1ebf c\u01a1 th\u1ec3 mi, v\u00e0 n\u1ebfu c\u01a1 ch\u1ebf n\u00e0y b\u1ecb c\u0103ng c\u1ee9ng, c\u1eadn th\u1ecb gi\u1ea3 s\u1ebd xu\u1ea5t hi\u1ec7n, l\u00e0m cho m\u1eaft kh\u00f4ng th\u1ec3 nh\u00ecn r\u00f5 nh\u01b0 b\u00ecnh th\u01b0\u1eddng. May m\u1eafn thay, c\u1eadn th\u1ecb gi\u1ea3 l\u00e0 t\u00ecnh tr\u1ea1ng t\u1ea1m th\u1eddi v\u00e0 m\u1eaft c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i sau m\u1ed9t th\u1eddi gian ngh\u1ec9 ng\u01a1i.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Tuy nhi\u00ean, n\u1ebfu kh\u00f4ng cho m\u1eaft \u0111\u01b0\u1ee3c ngh\u1ec9 ng\u01a1i \u0111\u1ee7 ho\u1eb7c h\u1ee3p l\u00fd, c\u1eadn th\u1ecb gi\u1ea3 c\u00f3 th\u1ec3 ti\u1ebfn tri\u1ec3n v\u00e0 tr\u1edf th\u00e0nh c\u1eadn th\u1ecb th\u1eadt, t\u1ee9c l\u00e0 t\u00ecnh tr\u1ea1ng m\u1eaft kh\u00f4ng th\u1ec3 nh\u00ecn r\u00f5 v\u1eadt \u1edf xa c\u0169ng nh\u01b0 g\u1ea7n. V\u00ec v\u1eady, \u0111\u1ec3 tr\u00e1nh t\u00ecnh tr\u1ea1ng n\u00e0y, h\u00e3y ch\u0103m s\u00f3c m\u1eaft v\u00e0 \u0111\u1ea3m b\u1ea3o cho m\u1eaft c\u00f3 th\u1eddi gian ngh\u1ec9 ng\u01a1i \u0111\u1ee7 sau khi ph\u1ea3i l\u00e0m vi\u1ec7c li\u00ean t\u1ee5c.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">C\u1eadn th\u1ecb tho\u00e1i ho\u00e1 (Degenerative Myopia)<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">C\u1eadn th\u1ecb tho\u00e1i ho\u00e1, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1eadn th\u1ecb \u00e1c t\u00ednh, l\u00e0 m\u1ed9t tr\u1ea1ng th\u00e1i c\u1eadn th\u1ecb k\u00e8m theo s\u1ef1 tho\u00e1i ho\u00e1 \u1edf b\u00e1n ph\u1ea7n sau c\u1ee7a nh\u00e3n c\u1ea7u. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, tr\u1ee5c c\u1ee7a nh\u00e3n c\u1ea7u ph\u00e1t tri\u1ec3n nhanh h\u01a1n b\u00ecnh th\u01b0\u1eddng, d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng m\u1eaft kh\u00f4ng \u1ed5n \u0111\u1ecbnh v\u00e0 li\u00ean t\u1ee5c gia t\u0103ng \u0111\u1ed9 c\u1eadn th\u1ecb. Do \u0111\u00f3, m\u1ecdi v\u1eadt xung quanh d\u1ea7n tr\u1edf n\u00ean m\u1edd \u0111i.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 m\u1ed9t lo\u1ea1i c\u1eadn th\u1ecb r\u1ea5t nguy hi\u1ec3m v\u00e0 nghi\u00eam tr\u1ecdng, th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n t\u1eeb khi c\u00f2n r\u1ea5t nh\u1ecf v\u00e0 ng\u00e0y c\u00e0ng tr\u1edf n\u1eb7ng h\u01a1n theo th\u1eddi gian. C\u1eadn th\u1ecb tho\u00e1i ho\u00e1 l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y suy gi\u1ea3m th\u1ecb l\u1ef1c v\u00e0 c\u00f3 th\u1ec3 g\u00e2y t\u0103ng nh\u00e3n \u00e1p, bong v\u00f5ng m\u1ea1c, th\u1eadm ch\u00ed d\u1eabn \u0111\u1ebfn m\u00f9 lo\u00e0.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Do \u0111\u00f3, nh\u1eefng ng\u01b0\u1eddi b\u1ecb c\u1eadn th\u1ecb tho\u00e1i ho\u00e1 n\u1eb7ng n\u00ean \u0111i kh\u00e1m v\u00e0 nh\u1ecf gi\u00e3n soi \u0111\u00e1y m\u1eaft s\u1edbm nh\u1ea5t c\u00f3 th\u1ec3 \u0111\u1ec3 ph\u00e1t hi\u1ec7n v\u00e0 \u0111i\u1ec1u tr\u1ecb k\u1ecbp th\u1eddi, gi\u00fap h\u1ea1n ch\u1ebf t\u00e1c \u0111\u1ed9ng c\u1ee7a b\u1ec7nh v\u00e0 b\u1ea3o v\u1ec7 th\u1ecb l\u1ef1c.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">C\u1eadn th\u1ecb ban \u0111\u00eam (Nocturnal Myopia):<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><br \/>C\u1eadn th\u1ecb ban \u0111\u00eam l\u00e0 m\u1ed9t d\u1ea1ng c\u1eadn th\u1ecb \u0111\u1eb7c bi\u1ec7t, x\u1ea3y ra khi ch\u00fang ta \u0111\u1ed1i m\u1eb7t v\u1edbi \u00e1nh s\u00e1ng y\u1ebfu ho\u1eb7c trong \u0111i\u1ec1u ki\u1ec7n \u00e1nh s\u00e1ng k\u00e9m, khi\u1ebfn m\u1eaft kh\u00f4ng th\u1ec3 nh\u00ecn r\u00f5. Th\u01b0\u1eddng th\u00ec v\u00e0o ban ng\u00e0y, kh\u1ea3 n\u0103ng nh\u00ecn c\u1ee7a m\u1eaft v\u1eabn b\u00ecnh th\u01b0\u1eddng.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng c\u1eadn th\u1ecb ban \u0111\u00eam \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch nh\u01b0 sau: Trong \u0111i\u1ec1u ki\u1ec7n \u00e1nh s\u00e1ng thi\u1ebfu, \u0111\u1ed3ng t\u1eed trong m\u1eaft m\u1edf r\u1ed9ng \u0111\u1ec3 thu th\u1eadp nhi\u1ec1u \u00e1nh s\u00e1ng h\u01a1n, nh\u01b0ng \u0111i\u1ec1u n\u00e0y l\u1ea1i t\u1ea1o ra m\u1ed9t h\u1ec7 qu\u1ea3 kh\u00f4ng mong mu\u1ed1n.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n, h\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng \u0111\u1ed3ng t\u1eed nh\u01b0 &#8220;c\u1eeda s\u1ed5&#8221; c\u1ee7a m\u1eaft. Khi \u0111\u1ed3ng t\u1eed m\u1edf r\u1ed9ng, n\u00f3 cho ph\u00e9p \u0111i qua nhi\u1ec1u \u00e1nh s\u00e1ng h\u01a1n \u0111\u1ec3 \u0111\u1ebfn v\u00f5ng m\u1ea1c, n\u01a1i \u00e1nh s\u00e1ng \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh t\u00edn hi\u1ec7u th\u1ea7n kinh. Tuy nhi\u00ean, \u0111i\u1ec1u n\u00e0y c\u0169ng l\u00e0m t\u0103ng sai s\u1ed1 quang h\u1ecdc, t\u1ee9c l\u00e0 s\u1ef1 r\u1ed1i lo\u1ea1n trong vi\u1ec7c l\u1ea5y n\u00e9t v\u00e0 t\u1eadp trung h\u00ecnh \u1ea3nh l\u00ean v\u00f5ng m\u1ea1c.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y l\u00e0m cho h\u00ecnh \u1ea3nh kh\u00f4ng r\u00f5 r\u00e0ng v\u00e0 g\u00e2y kh\u00f3 kh\u0103n cho ng\u01b0\u1eddi b\u1ecb c\u1eadn th\u1ecb ban \u0111\u00eam trong vi\u1ec7c nh\u00ecn th\u1ea5y \u0111\u1ed1i t\u01b0\u1ee3ng xung quanh, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi c\u00f3 \u00e1nh s\u00e1ng y\u1ebfu. \u0110i\u1ec1u \u0111\u00f3 c\u0169ng gi\u1ea3i th\u00edch v\u00ec sao nhi\u1ec1u ng\u01b0\u1eddi c\u00f3 c\u1eadn th\u1ecb ban \u0111\u00eam th\u01b0\u1eddng c\u1ea3m th\u1ea5y m\u1eaft m\u1edd m\u1ecbt, kh\u00f3 nh\u00ecn r\u00f5 khi di chuy\u1ec3n trong m\u00f4i tr\u01b0\u1eddng \u00e1nh s\u00e1ng k\u00e9m.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">C\u1eadn th\u1ecb th\u1ee9 ph\u00e1t (Induced Myopia):<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">C\u1eadn th\u1ecb th\u1ee9 ph\u00e1t c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n do nhi\u1ec1u nguy\u00ean nh\u00e2n, bao g\u1ed3m t\u00e1c d\u1ee5ng ph\u1ee5 c\u1ee7a m\u1ed9t s\u1ed1 lo\u1ea1i thu\u1ed1c, t\u00ecnh tr\u1ea1ng cao \u0111\u01b0\u1eddng huy\u1ebft (th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn ti\u1ec3u \u0111\u01b0\u1eddng), x\u01a1 ho\u00e1 thu\u1ef7 tinh (nuclear sclerosis), v\u00e0 m\u1ed9t s\u1ed1 nguy\u00ean nh\u00e2n kh\u00e1c.<\/p>\r\n<p>V\u1edbi \u0111\u1ed9i ng\u0169 b\u00e1c s\u0129 chuy\u00ean khoa h\u00e0ng \u0111\u1ea7u, trang thi\u1ebft b\u1ecb hi\u1ec7n \u0111\u1ea1i, ph\u1ee5c v\u1ee5 \u0111a d\u1ea1ng c\u00e1c d\u1ecbch v\u1ee5 kh\u00e1m v\u00e0 \u0111i\u1ec1u tr\u1ecb m\u1eaft, m\u1eddi b\u1ea1n tham kh\u1ea3o <strong><a href=\"https:\/\/www.docosan.com\/phong-kham\/benh-vien-mat-sai-gon-cach-mang-thang-8-917?utm_source=google&amp;utm_medium=banner&amp;utm_campaign=booking-phong-kham&amp;utm_id=MSGCMT8\">B\u1ec7nh Vi\u1ec7n M\u1eaft S\u00e0i G\u00f2n\u00a0<\/a><\/strong><\/p>\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<p><iframe style=\"height: 330px;\" src=\"https:\/\/www.docosan.com\/widget\/clinic-info\/917?book=1&amp;utm_source=embed-widget\" width=\"100%\" frameborder=\"0\"><\/iframe><\/p>\r\n\r\n<h2 class=\"wp-block-heading\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p:<\/h2>\r\n\r\n\r\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-question-1690173755980\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">C\u1eadn th\u1ecb bao nhi\u00eau \u0111\u1ed9 th\u00ec ph\u1ea3i \u0111eo k\u00ednh?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>C\u00f3 nhi\u1ec1u y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng, nh\u01b0ng th\u01b0\u1eddng khi \u0111\u1ed9 c\u1eadn th\u1ecb \u0111\u1ea1t kho\u1ea3ng 0.5 \u0111\u1ebfn 1.0 \u0111\u1ed9 th\u00ec n\u00ean \u0111eo k\u00ednh.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1690173787625\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">C\u00f3 bao nhi\u00eau \u0111\u1ed9 c\u1eadn?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>\u0110\u1ed9 c\u1eadn th\u1ecb kh\u00e1c nhau \u1edf t\u1eebng ng\u01b0\u1eddi, t\u1eeb nh\u1eb9 (kho\u1ea3ng 0.25 \u0111\u1ed9) \u0111\u1ebfn n\u1eb7ng (c\u00f3 th\u1ec3 h\u01a1n 6 \u0111\u1ed9).<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1690173814853\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">Bao nhi\u00eau tu\u1ed5i th\u00ec \u0111\u1ed9 c\u1eadn \u1ed5n \u0111\u1ecbnh?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>Th\u01b0\u1eddng l\u00e0 t\u1eeb 18-21 tu\u1ed5i, sau \u0111\u00f3 \u0111\u1ed9 c\u1eadn c\u00f3 th\u1ec3 kh\u00f4ng thay \u0111\u1ed5i nhi\u1ec1u.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1690173826989\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">C\u1eadn th\u1ecb m\u1ea5y \u0111\u1ed9 l\u00e0 n\u1eb7ng?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>C\u1eadn th\u1ecb t\u1eeb 3 \u0111\u1ed9 tr\u1edf l\u00ean \u0111\u01b0\u1ee3c coi l\u00e0 n\u1eb7ng.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1690173837238\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">\u0110\u1ed9 c\u1eadn th\u1ecb cao nh\u1ea5t l\u00e0 bao nhi\u00eau?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>\u0110\u1ed9 c\u1eadn th\u1ecb cao nh\u1ea5t c\u00f3 th\u1ec3 l\u00e0 20 \u0111\u1ed9 tr\u1edf l\u00ean, nh\u01b0ng ph\u1ee5 thu\u1ed9c v\u00e0o t\u1eebng tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1690173849909\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">C\u1eadn th\u1ecb m\u1ea5y \u0111\u1ed9 th\u00ec n\u00ean \u0111eo k\u00ednh?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>N\u00ean \u0111eo k\u00ednh khi c\u00f3 \u0111\u1ed9 c\u1eadn th\u1ecb t\u1eeb 0.5 \u0111\u1ed9 tr\u1edf l\u00ean \u0111\u1ec3 h\u1ed7 tr\u1ee3 nh\u00ecn r\u00f5 h\u01a1n, t\u00f9y thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9 c\u1eadn v\u00e0 nhu c\u1ea7u s\u1eed d\u1ee5ng.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Hi v\u1ecdng r\u1eb1ng th\u00f4ng qua b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n \u0111\u00e3 c\u00f3 th\u00eam th\u00f4ng tin v\u1ec1 c\u00e1ch t\u00ednh \u0111\u1ed9 c\u1eadn th\u1ecb c\u1ee7a m\u1eaft. N\u1ebfu b\u1ea1n ho\u1eb7c ng\u01b0\u1eddi th\u00e2n c\u1ee7a b\u1ea1n c\u1ea3m th\u1ea5y m\u1eaft c\u00f3 d\u1ea5u hi\u1ec7u b\u1ea5t th\u01b0\u1eddng v\u00e0 mu\u1ed1n kh\u00e1m m\u1eaft, xin vui l\u00f2ng \u0111\u1eb7t l\u1ecbch kh\u00e1m v\u1edbi chuy\u00ean gia ho\u1eb7c <a href=\"https:\/\/www.docosan.com\/chuyen-khoa\/mat-s9\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>b\u00e1c s\u0129 chuy\u00ean khoa m\u1eaft<\/strong><\/a> tr\u00ean Docosan.com.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.wikidoc.org\/index.php\/Myopia_classification\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.wikidoc.org\/index.php\/Myopia_classification<\/a><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.aao.org\/eye-health\/diseases\/myopia-nearsightedness\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.aao.org\/eye-health\/diseases\/myopia-nearsightedness<\/a><\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>C\u1eadn th\u1ecb, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Myopia ho\u1eb7c Nearsightedness trong ti\u1ebfng Anh, l\u00e0 t\u00ecnh tr\u1ea1ng kh\u00fac x\u1ea1 ph\u1ed5 bi\u1ebfn nh\u1ea5t \u1edf m\u1eaft, v\u00e0 \u0111ang tr\u1edf n\u00ean ng\u00e0y c\u00e0ng ph\u1ed5 bi\u1ebfn, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi h\u1ecdc sinh v\u00e0 ng\u01b0\u1eddi lao \u0111\u1ed9ng tr\u1ebb. C\u1eadn th\u1ecb khi\u1ebfn ch\u00fang ta ch\u1ec9 c\u00f3 th\u1ec3 nh\u00ecn r\u00f5 nh\u1eefng v\u1eadt \u1edf g\u1ea7n, [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":109566,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[385],"tags":[],"class_list":["post-105871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mat"],"acf":[],"featured_image_src":"https:\/\/www.docosan.com\/blog\/wp-content\/uploads\/2023\/08\/Cach-tinh-do-can-thi-cua-mat-chuan-5-600x400.jpg","featured_image_src_square":"https:\/\/www.docosan.com\/blog\/wp-content\/uploads\/2023\/08\/Cach-tinh-do-can-thi-cua-mat-chuan-5-600x533.jpg","author_info":{"display_name":"D\u01b0\u1ee3c s\u0129, Th\u1ea1c s\u0129 Nguy\u1ec5n Th\u1ecb Thanh T\u00fa","author_link":"https:\/\/www.docosan.com\/blog\/author\/tunguyen\/"},"_links":{"self":[{"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/posts\/105871","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/comments?post=105871"}],"version-history":[{"count":8,"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/posts\/105871\/revisions"}],"predecessor-version":[{"id":177684,"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/posts\/105871\/revisions\/177684"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/media\/109566"}],"wp:attachment":[{"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/media?parent=105871"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/categories?post=105871"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.docosan.com\/blog\/wp-json\/wp\/v2\/tags?post=105871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}