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Tuesday, 23 December 2014

Visual Acuity.

http://en.wikipedia.org/wiki/Eye

Visual acuity, or resolving power, is "the ability to distinguish fine detail" and is the property of cone cells.It is often measured in cycles per degree (CPD), which measures an angular resolution, or how much an eye can differentiate one object from another in terms of visual angles. Resolution in CPD can be measured by bar charts of different numbers of white/black stripe cycles.

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