This is best illustrated in the table below. The 20/20 line in the eye chart indicates the size of print a person with normal vision could read when he stands 20 feet away.Īlthough we use foot as the unit of measurement in above illustration, we can also express it in metre. There is no need for our eye to bend the light rays to focus them on the retina. At 20 feet, the light rays that enter our eyes are parallel. Our eyes are designed for distant vision. At first, the purpose was to determine distance acuity (i.e. The eye chart was first designed by a Dutch ophthalmologist, Herman Snellen in 1860s. If you have seen a eye exam chart before, you may be curious about how the eye chart was invented. Free Printable Eye Chart ( or Eye Exam Chart ) For Vision TestĪn eye exam chart is an important kit for your eye improvement process.
