optotypen.
/ˈɒptə(ʊ)tʌɪp/, U.S. /ˈɑptoʊˌtaɪp/ Ophthalmology.
A type or letter of definite size used for testing acuteness of vision; a test-type.
ΘΚΠ
society > communication > printing > types, blocks, or plates > relating to type > [noun] > for optical testing
optotype1886
1886 Mind 11 55 Single letters of 1.75 diopters were cut out of a book of Snellen's optotypes and pasted in horizontal rows 1 cm. apart on a white background.
1905 Trans. Amer. Ophthalmol. Soc. 42nd Ann. Meeting 648 Attempts have been made..to construct special optotypes adapted to the limited capacity and observing powers of young children and illiterates.
1970 A. H. Keeney Ocular Exam. iii. 29/1 Letters and numbers in the patient's own language most closely relate to his daily seeing requirements and therefore are the most practical optotypes.
2002 Ophthalmology 109 810 A new optotype chart was developed, with an optotype minimum angle of resolution that is independent of size.
This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).
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n.1886