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The unaided weak eye
In the weak eye, light rays entering the eye’s lens are not 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. This clear image is flooded by the blurred image known as the “blur circle”.

The central rays c, d and e are always in focus on the retina.
The outer rays a, b, f and g are blurred on the retina and form what is known as a 'blur circle'.

The unaided weak eye with Pinhole Glasses
When the pinhole lens is introduced, only rays c, d, e, are allowed to form an image on the retina and therefore no blur circle is formed. Consequently by using a lens with multiple pinholes, many focused images form on the retina and a clear natural image is seen.

The 'control' rays c, d and e are always in focus on the retina.
No 'blur circle' because the out of focus rays are prevented from entering the eye.

 

 

 

 

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