Lenses have been used since ancient times as magnifiers and other tools. Because of this, most people assume that lenses are required to focus images. In fact, one of the best ways to focus light is through the use of a tiny pinhole. Light passing through a pinhole can mirror the effect of a convex lens with additional benefit of unlimited depth of field. In other words a pinhole does not limit an image to one focal plane. It contains focused information about all objects near, far and in between.
Below is an simulation how Pinholes can correct vision. Please note that image focus will vary between individuals, the diameter and depth of a each pinhole.
There is a simple way to see this effect right now. Look at a distant blurry object then make a tiny hole using your index finger as seen below.
Move your hand in front of your eye and peer through the tiny hole. You can change focus simply by making the hole larger or smaller.
How do Pinhole glasses work?
Pinhole glasses work because of the way pinholes filter information passing through the hole and because of the way the human brain interacts with your eyes.
Pinhole glasses generate images by limiting the light waves from a real object to only the light waves that pass though the pinhole. The resultant flipped image is formed by the light waves that pass along lines through the pinhole. The larger the pinhole the more blurry the resultant image will become.
The human brain is always trying to focus on objects it is interested in. People with myopia cannot focus on distant objects because the lenses in their eyes cannot properly focus the light from distant objects on their retinas. When pinhole glasses are used, the light passing through the individual pinholes is automatically focused. The brain no longer tries to focus the light with your eyes because the image is already focused.
We recommend that people experience the effect of pinhole glasses. The pinhole effect is more than a novel physics phenomena. With advances in CCD imagers, computer technology and specifically AI technology, pinhole technologies will soon replace many lens based technologies we use today. All lenses cost money and have some inherent defects. Removing lenses from the equation can ultimately reduce costs and improve image quality.