ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
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.
Model release not required. Property release not required.