Pinhole glasses are eyeglasses with a series of holes in them that allow the wearer to receive less light directly to the retina which in turn increases your field of vision. They are made from solid materials such as plastic or metal and can be disguised to look like modern sunglasses.
The glasses have the effect of reducing the width of the bundle of oncoming rays from each viewed object. Normally whenever you glance at something the full opening of your pupil accepts light, but with pinhole glasses you are receiving a bent fraction of that amount of light. If you are troubled with conditions such as myopia, hyperopia, presbyopia, or an astigmatism then pinhole glasses will increase your ability to see longer distances and see with a higher quality of detail.
The basic concept that the glasses work on is that no matter how wide open your pupils are only the central portion is receiving light. The pieces of plastic or metal inbetween the holes makes sure to keep light from reaching the outer edges of your pupil which in turn increases your focus and vision.
An easy way to demonstrate the affect of the pinholes is to close one eye while making a fist and holding it up to your open eye. Now slowly open your fist so just enough light shines though for you to see. If you do this correctly your vision will be remarkably better than when a full amount of light is hitting your pupil.
The pinhole affect can trace its origins to native Alaska. The natives would wear glasses with narrow slits in them to block out the intense glare received from the sunshine that is reflected off the snow and ice. Anyone who lives in a snowy environment for long periods of time can develop snow blindness from the glare which can only be healed by avoiding light.
From native beginnings to modern eyewear pinhole glasses have long been used to increase the focus and vision of those people who utilize this light blocking technology.
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Pinhole glasses are not made of glass but an opaque substance like metal or plastic. There are many little holes in the material that reduce the width of diverging rays. Because of this, the pinholes cause clearer vision in those who have myopia, farsightedness, diminished focus and astigmatism. The pupil may be wide open but only the central part is getting light. The visual improvement is greatly noticed.
A man named Scheiner first discovered this effect in 1573. Pinhole cameras operate the same way by increasing the depth of focus. An example of how the pinhole works is when someone will squint to see something clearer. By doing this, the upper and lower eyelids cut off rays that normally enter the pupil and the vision does improve a bit. By looking through the pinhole glasses, this cuts off rays from all sides. These glasses are worn very close to the eye, however in time, the brain ignores the material. While reading a book or paper, the little pinholes are more noticeable because of the short distance used. However, while watching TV or something farther away, only one pinhole would need to be used.
Some advantages of pinhole glasses include, being a simple solution to reading or close work. They provide improved vision at all distances, not just close or far. Pinholes could be used for a whole lifetime, unless they break. They are more inexpensive than prescription glasses. When pinholes get scratched, there is no effect on their performance. They also don’t need to be cleaned; fingerprints or marks do not affect the vision. These are for all ages, so even children can benefit by them. Cataract patients can see better through them. They can also prevent myopia. With so many people at computer screens, wearing pinholes can greatly reduce eye strain.
There are many advantages to pinholes, however, they cannot entirely eliminate the need for prescription glasses. It is so important to visit your eye doctor and know exactly what is best for you.
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Pinhole glasses may look like ordinary sunglasses until you take a closer look. Instead of being outfitted with glass lenses, these special glasses feature an opague metal or plastic material which has been punched full of numerous small holes. Pinhole glasses have been used by many individuals as a health device to improve their clarity of vision.
An individual usually winds up wearing prescription eyeglasses for vision improvement because the improper way that light bends as it enters their pupil causes myopeia (nearsighedness), hyperopia (farsightedness) or presbyopia (dimished focus of range caused by age). Looking through pinholes instead of regular lenses, however, reduces the width of light rays that actually enter the eye’s pupil. Because the amount of light that improperly bends is greatly reduced and only the central part of a person’s pupil is receiving light, an improvement in clarity and sharpness of vision results. This same principle has been used for decades by people in Alaska, who often wear eyeglasses with slits that successfully cut down the amount of glare from the abundant snow and ice in the environment.
There are a number of benefits to using pinhole glasses to improve your vision in preference to prescription lenses. Because these glasses can improve visual acuity at all distances, they can replace bifocals and trifocal eyeglasses for close-up reading as we age. These special glasses never need changing like prescription glasses, are suitable for all ages and cannot be scratched like glass lenses. They provide a multi-purpose eyeglass which can be worn to improve vision when reading, watching TV or looking at things at a distance. They are excellent for reducing visual tiredness when doing computer work, can be used as sunglasses, can improve vision for anyone who has had eye surgery and is affected by glare, starbursts or halos appearing around lights and they have proven effective at helping people with cataracts see more clearly.
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