Definitions
from The Century Dictionary.
- noun A letter of a definite size selected as a test for acuteness of vision; a test-type, as those of Snellen.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
standardized symbol fortesting vision .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
opto- + -type
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