215F 21.5 Inch HD LCD Visual Acuity Chart VisionTest Projecter Monitor for Ophthalmic Exam
The eye test chart is placed at a standardized distance away from the person whose vision is being tested. The person then attempts to identify the symbols on the chart, starting with the larger symbols and continuing with progressively smaller symbols until the person cannot identify the symbols. The smallest symbols that can be reliably identified is considered the person's visual acuity.
The Snellen chart is the most widely used. Alternative types of eye charts include the logMAR chart, Landolt C, E chart, Lea test,Golovin–Sivtsev table, the Rosenbaum chart, and the Jaeger chart snellen chart.

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