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2. Pinhole occluder - Wikipedia

   en.wikipedia.org/wiki/Pinhole_occluder

   A pinhole occluder is an opaque disk with one or more small holes through it, used by ophthalmologists, orthoptists and optometrists to test visual acuity. The occluder is a simple way to focus light, as in a pinhole camera, temporarily removing the effects of refractive errors such as myopia. Because light passes only through the center of the ...

3. 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 ...

4. 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 ...

5. 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.

6. Overview of common vision problems and medications - AOL

   www.aol.com/overview-common-vision-problems...

   Instead, glasses, contact lenses, and surgery are used to correct them as necessary. Other problems may be treated with medication if the supervising doctor deems it appropriate.

7. Subjective refraction - Wikipedia

   en.wikipedia.org/wiki/Subjective_refraction

   An occluder is placed over the eye that is not being tested (e.g.: over the left eye, to test the right eye's vision). A pinhole occluder is then placed before the patient's eye, and their vision is then tested again (each eye separately) to determine if the patient's poor visual acuity is a result of optical irregularities, or pathological issues.

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.

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