Difference between revisions of Visual acuity

Visual acuity (view source)

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	For distance, this is typically measured with a [[Snellen chart]] and expressed as the distance you need to be from the chart to recognize the characters over the distance that someone with normal vision can recognize the characters. Lens or mirrors may be used to change the effective test distance in a smaller room.		For distance, this is typically measured with a [[Snellen chart]] and expressed as the distance you need to be from the chart to recognize the characters over the distance that someone with normal vision can recognize the characters. Lens or mirrors may be used to change the effective test distance in a smaller room.


	For near, this is typically measured with a near vision test chart at 40 cm.		For near, this is typically measured with a near vision test chart at 40 cm.