| 单词 | metre-angle |
| 释义 | > as lemmasmetre-angle metre-angle n. [after German Meterwinkel (A. Nagel in A. Graefe and T. Saemisch Handb. der gesammten Augenheilkunde (1880) VI. x. 479)] Optics a unit of convergence equal to the angle between the line of sight of either eye and the median line passing between them when they are focused on a point on that line one metre away. ΘΚΠ the world > physical sensation > sight and vision > [noun] > metre-angle metre-angle1886 1886 C. M. Culver tr. E. Landolt Refraction & Accomm. of Eye ii. 187 We are indebted to Nagel for the ingenious idea of rendering the mensuration of convergence so simple and..so practical. He calls this unit-angle the ‘Meterwinkel’ metre-angle. 1949 H. C. Weston Sight, Light & Efficiency i. 27 The value of the metre-angle depends on the distance apart of the two eyes, but is commonly equal to about 1·75°. 1964 S. Duke-Elder Parsons' Dis. Eye (ed. 14) xxviii. 455 With an emmetropic person the amount of convergence, reckoned in metre angles, is the same as the amount of accommodation reckoned in dioptres. 1983 Jrnl. Optical Soc. Amer. 73 332/1 Accommodation is said to be appropriate when the accommodation in diopters equals the convergence in meter-angles. < as lemmas |
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