Glasses have been around for centuries to help improve and provide clearer vision. More modern methods of vision correction such as contact lenses and eye surgery are more advanced, but actually treat the symptoms rather than the cause, just as glasses do. Even pinhole glasses have been used to focus light rays on the retina.
It is believed that glasses promote further deterioration of the eyes, and prevent natural healing. Glasses put additional strain on the eyes. Natural vision coaches recommend their clients stop wearing, or at least get a reduced prescription, when using natural vision correction methods. Natural vision coaches teach that if the eyes are relaxed and reconditioned, vision will improve. Eye exercises are used to train coordination and flexibility for muscles in and around the eye. They strengthen the muscles and nerves in the brain and vision system to help correct vision.
Relaxed central vision is a key to natural eyesight improvement according to the natural vision coaches, or Bates Method practitioners. However there is some debate whether natural vision correction is valid. For example it is not recognized by the American Optometric Association.
People that practice natural vision correction usually are not licensed professionals however; some licensed professionals may practice natural correction on the side.
The benefits of natural vision correction are that it is a non-invasive, natural, and holistic method that can be used alongside other vision aids such as glasses and contact lenses. There is no risk involved whilst trying natural vision correction methods. The downside is that it can take time to notice any benefits.
PRK is used to correct or reduce myopia (shortsightedness or nearsightedness), hyperopia (longsightedness or farsightedness), and astigmatism. The PRK procedure flattens part or all of the cornea which in turn allow focal point of light to focus more closely on the retina. PRK differs from Lasik in that it does not create a permanent flap in the cornea, instead it uses the excimer laser exclusively from start to finish, essentially scraping the top level of the cornea. The benefits of PRK is that it is simple and non-intrusive as compared to lasik. As with all surgery there can be complications.
Pinhole glasses, also known as stenopeic glasses (from Greek meaning “little opening”), are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. It works on the same principle of the pinhole camera; each hole allows only a very narrow beam of light to enter the eye which focuses on the retina and increases the depth of field. In eyes with refractive error, the result is often a clearer image. Unlike conventional prescription glasses, pinhole glasses produce a clear image without the pincushion effect around the edges (which makes straight lines appear curved). While pinhole glasses are useful for people who are both near- and far-sighted, they are not recommended for people with over 6 diopters of myopia. It should also be noted that pinhole glasses reduce brightness and peripheral vision, and thus should not be used for driving or when operating machinery.
Pinhole glasses have been marketed by various companies on the claim that—combined with certain eye exercises—they could permanently improve eyesight. These claims have been analyzed, but no scientific evidence has been found to support them, and the claims are no longer allowed to be made in the United States under the terms of a legal settlement with the Federal Trade Commission.