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2. Pinhole glasses - Wikipedia

   en.wikipedia.org/wiki/Pinhole_glasses

   Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera , each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...

3. Bates method - Wikipedia

   en.wikipedia.org/wiki/Bates_method

   The Bates method is an ineffective and potentially dangerous alternative therapy aimed at improving eyesight.Eye-care physician William Horatio Bates (1860–1931) held the erroneous belief that the extraocular muscles caused changes in focus and that "mental strain" caused abnormal action of these muscles; hence he believed that relieving such "strain" would cure defective vision.

4. Pinhole occluder - Wikipedia

   en.wikipedia.org/wiki/Pinhole_occluder

   An improvised pinhole has a similar but better effect. The same principle has also been applied as an alternative to corrective lenses: a screen of pinholes is mounted on an eyeglass frame and worn as pinhole glasses. Differential diagnosis: pinhole worsen vision: Macular diseases, [5] central lens opacities [6] Vision static with pinhole ...

5. 8 surprising ways your brain powers the rest of your body - AOL

   www.aol.com/8-surprising-ways-brain-powers...

   The pinhole helps focus the light, creating a clearer image. (Of course, most of us use glasses or contact lenses to correct refractive errors — they’re much more efficient!) 7.

6. Eclipse eye safety: How to make a pinhole projector, test ...

   www.aol.com/eclipse-eye-safety-pinhole-projector...

   Punch a pinhole into the aluminum foil and tape it over one side of the box. Tape the white sheet of paper to the inside of the other side of the box. Stand with the sun behind you.

7. Pinhole (optics) - Wikipedia

   en.wikipedia.org/wiki/Pinhole_(optics)

   Wide-field micrograph of a damaged 80 μm pinhole Natural pinholes formed by tree leaves – Solar eclipse of August 21, 2017 in Washington state. A pinhole is a small circular hole, as could be made with the point of a pin. In optics, pinholes with diameter between a few micrometers and a hundred micrometers are used as apertures in optical ...

8. Forgot to get solar eclipse glasses? Here's how to DIY a ...

   www.aol.com/forgot-solar-eclipse-glasses-heres...

   Looking at eclipse without proper glasses is dangerous. Luckily, there are DIY options for those who forgot to order a pair in time for April 8.

9. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Pinhole glasses are a type of corrective glasses that do not use a lens. Pinhole glasses do not actually refract the light or change focal length. Instead, they create a diffraction limited system, which has an increased depth of field, similar to using a small aperture in photography. This form of correction has many limitations that prevent ...