Eye test using the Snellen chart. The visual acuity (sharpness of vision) of each eye is checked by reading letters of different sizes from the same distance. Refraction testing (using lenses of different strengths) may be carried out to determine what glasses or contact lenses are needed | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Hart-Davis, Adam |
Taille de l’image : | 3678 px × 4740 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |