GOST R ISO 9342-2-2013 Optics and optical instruments Test lenses for calibration of focimeters Part 2 Test lenses for focimeters used for measuring contact lenses《光学和光学仪器 焦距计校准用检验.pdf

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4、20140701 1 , - . , - (. 3). 9342 , 8598. 2 , - . -. , - . . : 7944:1998 . (ISO 7944:1998, Optics and optical instruments Reference wavelengths) 3593:1996 . (ISO 3593:1996, Optics and opti-cal instruments Focimeters) 3 : 3.1 Fbv (back vertex power): , - . 1 - 1. D (). 2 . 3.2 (spherical test lenses):

5、 - , . 3.3 (reference wavelength): 7944. 9342-22013 2 - 9342 , - (e = 546,07 ) (d = 587,56 ). 4 4.1 , - 4 , . , , - , - . , - , . 4.2 - : - 20 D; - 15 D; - 10 D; - 5 D; + 5 D; + 10 D; + 15 D; + 20 D. : 8 . , - , 7 9 . : 8 ( 18369-3), . - 0,1 . 1. 1 Fbv, - 1() , - 20 0,5 1,5 - 15 0,5 1,5 - 10 0,5 1,5

6、 - 5 0,5 1,5 + 5 1 - 2 + 10 1 - 2 + 15 1 - 2 + 20 1 - 2 . . 5 , - . - 0,03 - 1 (). - , 1. 9342-22013 3 A () A.1 , , 4.2 5, , .2 .8. - , - . A.2 . 510- 5. A.3 (. , -) (8 0,1) . A.4 , , A.3. A.5 , - 1, - ( ) (. A.6), r1 r1 = (n - 1) 1/(Fbv F2) + t/n, Fbv , - 1 (); F2 ( ) (, ) , - 1(). , , r1, . , , .

7、A.6 Fbv (. 3.1), r1, r2, t - n (, , ) : F1 = (n - 1)/r1; F2 = (1 - n)/r2; K = 1/(1 - tF1/n); Fbv = KF1 + F2, F1 ( ) (, - ) , - 1; K , . Fbv - r1, r2, t n. . 9342-22013 4 A.7 : -, , - . , . , , , . , .1, - ( ), 5. .1 - -, - 1() , - 20; - 15; - 10; - 5 0,005 510- 5 , 10 + 5; + 10 0,003 + 15; + 20 0,002 ( ) ,