Aller au contenu

What is refractive error?-Forum-Culture Informatique

SVP pensez à vous inscrire
sp_LogInOut Connexion sp_Registration S’inscrire
S’inscrire | Mot-de-passe perdu ?
Recherche avancée
Activité du forum


Options du forum

La longueur du mot recherché est au minimum de 3 caractères et au maximum de 84 caractères
sp_Feed Flux RSS du sujetsp_TopicIcon
What is refractive error?
23 avril 2024
Level 0
Nombre de messages du forum : 4
Membre depuis :
9 juin 2023
sp_UserOfflineSmall Hors ligne

With normal vision, light reflected from an object enters the eye through the cornea (the curved, transparent surface that protects the front of the eye). Because the cornea focuses (refractors) these light rays pass through the eye’s natural lens, where they are converged to focus at a sharp point on the retina (the back layer of the eye that contains sensitive cells). with light). Retinal cells convert light rays into electrical impulses that are sent to the brain (via the optic nerve) and processed to form images.

Refractive error is a phenomenon in which light from an object does not reach the retina but is in front or behind or many points on the retina, causing the image of the object to be blurred and we will not be able to see the object clearly.

  1. Causes of refractive error

The main reason is that due to the rapid development of technology, people are increasingly dependent on electronic devices with blue light that is harmful to the eyes, especially children’s early exposure to gadgets. technology at an increasing rate. These refractive errors will affect and cause difficulties in daily biology as well as in studying, working and daily activities.

  1. Symptoms of refractive errors

Blurred or distorted vision

Difficulty focusing on near or far objects

Squint to read

Color blindness: color blind test

Eye strain or fatigue

If you experience any of the above symptoms, you should see your doctor for a general eye exam.

  1. Effects of refractive error

There are 4 types of refractive errors: Myopia, Farsightedness, Astigmatism, Presbyopia, of which myopia accounts for more than 70% of refractive errors in Vietnamese children. In 2010, there were only about 1.8 billion people in the world with refractive errors, but by 2020 this number has doubled. In developing countries, where people are less interested in regularly checking their vision health, this rate is especially increasing rapidly and much higher. In Vietnam alone, the rate of myopia has reached over 38%.

Fuseau horaire du forum :Europe/Paris
Nb max. d’utilisateurs en ligne : 240
Actuellement en ligne : getassist
Invité(s) 5
Consultent cette page actuellement :
1 Invité(s)
Auteurs les plus actifs :
clamb89: 78
Tomas29: 62
annykeys: 35
Richardreece: 35
Camille: 30
hsdrw33: 29
victorpatrick: 25
Loch: 25
xoxeqime: 22
xoxosta: 21
Statistiques des membres :
Invités : 145
Membres : 1379
Modérateurs : 0
Administrateurs : 0
Statistiques du forum :
Groupes : 1
Forums : 4
Sujets : 1158
Messages :3882
Nouveaux membres :
moomin, sulo167, barek1337435, garyjones2356, MorganHarmonie, mediapract, hoalkind, kristiastra,, mish2254
Administrateurs :
Comme d'habitude, tous les commentaires sont les bienvenus.
Inscrivez-vous à la lettre d'information. Celle-ci vous parviendra dès la parution de nouveaux articles. Vous trouverez la zone d'inscription à la lettre d'information en haut à droite de l'écran.
Et enfin, pour toutes vos questions techniques, utilisez le forum. D 'autre utilisateurs pourront vous répondre et vous aider. Cliquez ici pour accéder au forum...
Ads Blocker Image Powered by Code Help Pro

Ads Blocker Detected!!!

We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker.

Powered By
Best Wordpress Adblock Detecting Plugin | CHP Adblock