Vision ∙ Vue ∙ Vista ∙ Syn ∙ зрение ∙ 视力
Jens G. Hetland, Professor, MD, Ph.D, Oslo, Norway
Sponsored by Arthur and Odd Clausons Legacy for vision and eye care
for people who want to study visual acuity and visual fields interactively

Syn for alle - On Tonometry - Experimental Tonography

Download the book pupilseye logo

You need to upgrade your Flash Player Upgrade here please.

When reading, the parallell rays change into a divergent direction towards the eye. In order to keep the rays in focus on the retina, the lens increases its refractive power automatically by getting thicker (accommodation of the eye).

With increasing age this ability of the lens to increase its power is gradually reduced. Therefore reading glasses are necessary between the age of 40 and 50 years

The tests are for educational purposes only to illustrate hypothetical cases
This site was last updated 15 March 2010