Pinhole glasses or stenopeic glasses utilize opaque materials with small perforations in each lens, rather than glass lenses, to reduce blurriness for people with vision problems. The perforations reduce the amount of diverging rays that hit the pupil from a viewed object, thus reduced blurriness in people with refractive vision disorders. Refractive vision disorders include myopia, presbyopia, and farsightedness. There are also benefits for people with cataracts, a cataract is an opaque spot on the eye that causes light to scatter when entering the pupil, the use of pinhole glasses, reduces the amount of light hitting the cataract, less light is then scattered, and as a result blurred vision can be improved dramatically.
There are many advantages in choosing pinhole glasses over prescription glasses. The first is cost, prescription glasses are expensive and their use of glass lenses leaves them vulnerable to scratches and glass lenses break if dropped. The glass lenses in prescription glasses also need to be cleaned of fingerprints and debris, to maintain clear vision through the lens.
It is believed that the eye disorder myopia can be prevented, by using perforated lenses. Myopia is caused when the eye extends to due excessive close work, when a person develops Myopia, light entering the eye focuses before the cornea. This results in extremely blurry vision, reducing the amount of light entering the eye, eases eye strain when performing work in close proximity to the eyes.
There are certain disadvantages to using pinhole glasses. Their perforated opaque lenses reduce the wearer’s peripheral vision, which can be dangerous in certain situations. They should not be worn while driving, operating heavy machinery, or when safety glasses are required. It is also a good idea to avoid wearing them in dim light situations, as the perforations reduce the amount of light entering the eye. If using them as reading glasses, extra light will be needed to reduce eyestrain.
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Pinhole glasses, also called stenopeic glasses are made from an opaque substance that allows many tiny holes in the material through which one can obtain better vision. These glasses are created for people with conditions such as presbyopia, myopia, hyperopia and astigmatism. They are not intended to treat these conditions, only to enhance one’s vision.
The pinholes work by blocking peripheral rays and only allowing rays to pass through the centrally portioned aspect of the pupil. The pupil can be open wide but pinhole glasses will only allow the rays to be passed to that one certain area. As an example of how this works, one can hold a comb in front of their eyes and look through the teeth of it. Essentially, this will give the same effect as pinhole glasses.
While pinhole glasses are a bit on the expensive side, although much cheaper than prescription glasses, they do have several advantages over regular prescription glasses. Unlike prescription glasses that only get weaker over time, pinhole glasses will last a lifetime unless the pinholes happen to break. Scratching of the lens on prescription glases has a great impact on the ability to see clearly; scratches on pinhole glasses does not the alter the ability to see. Pinhole glasses do not need to be cleaned of fingerprints and other smudges as do regular prescription glasses.
People who suffer with cataracts, the passing of light which causes it to scatter, find that pinhole glasses provide a great improvement in their vision. The glasses are also used in the prevention of Myopia, especially in school-aged children who have trouble viewing the board.
Pinholes do have certain limitations and there are some instances where they are not recommended for use.
When using them, there should be an adequate amount of light to focus on the object you are viewing. Also, young people who are very farsighted should not use pinholes.
While pinholes are not intended to treat certain conditions, they are highly effective when used for reading or other up-close work by reducing the amount of focus strain on the eye.
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