When two objects are close together, they tend to blur together and can not be told apart by the human eye anymore. More specifically, the chart finds our ‘resolution limit.’ Our resolution limit is the shortest distance between two points that can determined by our eyes as separate objects. It measures each individual’s visual acuity by degrees. ![]() The eye chart’s purpose is to measure visual acuity, and it does this by using precise math. The chart has not changed much sense and the same science and measurement behind it are used today! How It Works He created the chart originally to be made up of shapes, but later changed it to be letters. Herman Snellen, a Dutch optometrist, created the chart in 1862. ![]() But, even though the chart may appear as just a white poster with black letters eventually getting smaller, there is a real science to it! Who Created The Eye Chart The infamous eye chart we see at the DMV, or wherever we get our eyes tested, is a useful tool that helps determine our vision quickly and easily. ![]() The simple eye test they make you take at the DMV is more than what it seems.
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