test types

Letters of various sizes used to test visual acuity.
- Jaeger t. type of different sizes used for testing the acuity of near vision.
- point system t. a near-vision test chart in which the various t. are multiples of a point (172 inch), lower-case letters being one-half the designated point size; reading 4-point at 16 inches is normal, and is designated N-4.
- Snellen t. square black symbols employed in testing the acuity of distant vision; the letters vary in size in such a way that each one subtends a visual angle of 5′ at a particular distance.

Medical dictionary. 2011.

Look at other dictionaries:

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