This Color vision testing is based on the Ishihara Test for color blindness. Color blindness is a condition where people find it difficult to distinguish between certain colors. This color blindness ...

Science Museum, London/Wellcome Images, Wikimedia Commons // CC BY 4.0. The tests were adopted throughout the world beginning in the early 1920s, and eventually grew into a set of 38 plates.

A perfect 20/20 score on an eye chart test doesn't mean you have perfect vision: Visual acuity, along with color, contrast, and depth perception, are all important parts of healthy eyesight.

During the test, you’ll sit or stand a specific distance away from the chart and cover one eye. You’ll read out loud the letters you see with your uncovered eye. You’ll repeat this process ...

Searching on Google, TikTok 'eye color chart', you should be able to find the chart and download the image. Then head to TikTok, open the 'Green Screen Eyes and Mouth' effect ready for your video.

At least once in your life, you must have squinted at the eye chart at the doctor’s office or DMV, trying to make out the blurry bottom line. Turns out, there’s some very precise math that ...

This eye test chart was first invented by Ferdinand Monoyer, a French opthalmologist, or eye doctor, who would have been 181 years old today. Who was Ferdinand Monoyer?

Most people should have a regular eye exam every couple of years. If you're older than 65 or have certain conditions, you may need more frequent checks. (Photo Credit: iStock/Getty Images.) Many ...