In the United States, the standard placement of the eye chart is on a wall that's 20 feet away from your eyes. However, since many eye doctors have offices shorter than 20 feet long, the eye chart may hang behind the patient chair and reflect onto mirrors to simulate a distance of 20 feet.
Eye charts can be configured in various ways. This means that your visual acuity is very poor. Since eye charts only measure visual sharpness, they can help your eye doctor figure out whether you need prescription eyeglasses or contact lenses.
They can also help your local Department of Motor Vehicles determine who needs corrective lenses to drive and who shouldn't drive due to legal blindness. But eye charts don't measure your peripheral vision , depth perception, color vision or ability to perceive contrast.
They can't monitor things like eye pressure or the condition of your retinas. This is why, as important as eye charts are, they remain just one component of a complete eye exam.
Take our at-home vision quiz. Adam Debrowski also contributed to this article. Can Jaeger numbers be standardized. May What is an eye chart?
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