| 单词 | test card |
| 释义 | > as lemmastest card test card n. (a) Ophthalmology a large card printed with rows of letters of decreasing size for use in testing visual acuity (cf. Snellen n.); (b) Television a diagrammatic still picture transmitted outside normal programme hours and designed for use in judging the quality and position of the image on any particular screen. ΘΚΠ society > communication > broadcasting > television > [noun] > specific transmission for adjustment of sets test card1892 the world > health and disease > healing > ophthalmology or optometry > [noun] > kinds of eye-test > card used in testing sight test card1892 test chart1910 1892 A. Duane tr. E. Fuchs Text-bk. Ophthalmol. iii. ii. 609 When the visual acuity has become so reduced that the largest letters of Snellen's test-card can no longer be recognized at 6 metres, the patient must go up nearer it. 1935 Popular Wireless 16 Mar. 14/2 The ‘test cards’ radiated recently by the B.B.C. have..been the cause of a lot of correspondence. 1949 H. C. Weston Sight, Light & Efficiency vii. 245 External light sources must be relied upon for illuminating the test-cards. 1962 Which? Mar. 70/2 To measure the resolution, we used the BS test-slide which has blocks of parallel lines of various thicknesses and spacings, similar to the test card shown to television viewers so that they can adjust their sets for a clear, sharp picture. 1978 S. Wilson Dealer's Move iii. vi. 103 A buzzing in my head to match the buzzing of the test card on the screen. < as lemmas |
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