1. eyesight; vision; visual acuity
Wikipedia definition
2. Visual acuityVisual acuity (VA) is acuteness or clearness of vision, which is dependent on the sharpness of the retinal focus within the eye and the sensitivity of the interpretative faculty of the brain. Visual acuity is a measure of the spatial resolution of the visual processing system. VA is tested by requiring the person whose vision is being tested to identify characters (like letters and numbers) on a chart from a set distance.
Read “Visual acuity” on English Wikipedia
Read “視力” on Japanese Wikipedia
Read “Visual acuity” on DBpedia


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