2. How Pinhole Glasses Work

The theory of how pinhole glasses work

a. The unaided weak eye without Pinhole Glasses

pinholes long short sighted cataracts optometrist suppliers opthalmology astigmatism eye strain pinholes pinhole spectacles pinhole spectacles presbyopia double vision cross eyed seeing perception improved eyesight pinhole glasses blurred 20/20 spectacles optometry
Diagram 1

In a weak eye, light rays entering the eye's lens are not all focused onto the same place on the retina. For example rays a b f g, require more focusing by the lens to hit the same plane as rays c d e, which are nearer to the centre. Rays c d e are usually always in focus, regardless of the condition of the eye, and form a clear image on the retina. This clear image is flooded by the blurred image known as the "blur circle" formed by rays a b f g.

b. The unaided weak eye with Pinhole Glasses

Diagram 2

When the pinhole lens is used, only rays c d e are allowed to form an image on the retina and no blur circle is present to block the clear image. Consequently, by using a lens with multiple pinholes, many focused images form on the retina and a clear, natural image is seen. Also, no effort is required from the eye muscles, as the only rays entering the eye are already in focus. Hence there is a dramatic consequential, relaxing effect.

3. Evidence

View cart contents. (Note: You must have cookies enabled for this button to work!)   View cart contents. (Note: You must have cookies enabled for this button to work!)

Web Development Copyright © 1997-2008 Cyberlab Systems Pty Ltd. All rights reserved. All prices in this web site are quoted in American Dollars ($US). Hosted by Ozelink - a home for your page. Click here to view disclaimed details regarding this web site and the products within it. Last modified: September 14, 2011. Click here to view hot links to other recommended sites.