c (medicine) and resolution acuity (medicine)

c (medicine)

c
<radiobiology> Speed of light, 3.0x10E+8 metres/second or 3.0x10E+10 cm/sec

resolution acuity

The detection of a target having two or more parts, often measured by using the Snellen test types; indicated by two numbers: the first represents the distance at which an individual sees the test types (usually 6 meters or 20 feet), and the second, the distance at which the test types subtend an angle of 5 minutes; e.g., vision of 6/9 indicates a test distance of 6 meters and recognition of symbols which subtend an angle of 5 minutes at a distance of 9 meters.

Synonym: visual acuity.

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