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2. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   Snellen chart. Purpose. Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula ...

3. How to Read an Eye Prescription: What the Numbers Mean

   www.healthline.com/health/how-to-read-eye...

   Eyeglass strength is measured in diopters. If your prescription reads -1.00, that means your eyeglasses need 1 diopter of strength to correct nearsightedness. If your prescription reads +2.50 ...

4. Eye chart - Wikipedia

   en.wikipedia.org/wiki/Eye_chart

   An example of the Landolt C eye chart (also known as the Japanese eye chart.). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]

5. How to Use the Amsler Grid to Test Your Vision - Healthline

   www.healthline.com/health/using-the-amsler-grid

   Here’s how to use the Amsler grid as part of monitoring your wet AMD: 1. Print out the Amsler grid. The Amsler grid looks best on pure white matte paper. You can get your own copy to print off ...

6. Do I Need Glasses? Exam, Reading, Headaches, and More

   www.healthline.com/health/do-i-need-glasses

   Symptoms of needing glasses can vary depending on the kind of eye issue you’re having. Common symptoms include: blurred vision. double vision. fuzziness (when objects don’t have defined, clear ...

7. Do I Need Reading Glasses? - WebMD

   www.webmd.com/eye-health/need_reading_glasses

   As your eyes get less flexible, your close vision gets worse. It's a condition called presbyopia, and it may make you wonder if you need reading glasses. Here are a few signs that you do: When you ...

8. Pupillary Distance: Types and How to Measure - WebMD

   www.webmd.com/eye-health/pupillary-distance

   Cover your right eye with your hand. Your friend will line up the 0 millimeters with the center of your left pupil. Uncover your eye, look straight ahead, and then cover your left eye. Your friend ...

9. Progressive Lenses: Pros and Cons of Progressive Lens Glasses

   www.webmd.com/eye-health/about-progressive-lenses

   With progressive lenses, you won't need to have more than one pair of glasses with you. You don't need to swap between your reading and regular glasses. Vision with progressives can seem natural ...