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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. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...

4. Pupillary light reflex - Wikipedia

   en.wikipedia.org/wiki/Pupillary_light_reflex

   Pupillary light reflex. Variation in the size of the pupil in bright (left) and dim (right) environments. In this case the pupil is 3 mm in diameter on the left, and 9 mm on the right. The pupillary light reflex (PLR) or photopupillary reflex is a reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light ...

5. Medical prescription - Wikipedia

   en.wikipedia.org/wiki/Medical_prescription

   In the countries of the UK, National Health Service (NHS) prescriptions are either free or have a fixed price per item; [43] a prescription may be issued so the patient does not have to purchase the item at commercial price. Some medical software requires a prescription. [44] Legislation may define certain equipment as "prescription devices". [45]

6. Free COVID-19 tests are now available. Here's how you ... - AOL

   www.aol.com/free-covid-19-tests-now-130709804.html

   Free at-home COVID-19 tests are now available for families across the nation. As of Thursday, families are now able to obtain up to four free COVID-19 tests through the U.S. Department of Health ...

7. Eye chart - Wikipedia

   en.wikipedia.org/wiki/Eye_chart

   Lea test. logMAR chart. An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. [1] Eye charts are often used by health care professionals, such as optometrists, physicians and nurses, to screen persons for vision impairment.