Pinholes provide an infinite depth of focus so that even when the eye is not correctly focused, object will appear as if in focus. They eliminate scattering of the light to the retina and hence help to improve vision.
Just looking through any pinhole and you will see blurred image become focus. This is because the amount of peripheral light rays is reduced with appropriately spaced multiple pinholes, you will get clear straight vision without the difficulty of concentrating on a single hole. Regular use of these pinhole (VISION) glasses helps exercise eye muscles and helps eye to relax.
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