" ". , . , . . , , 1 , . , . , .
70 60 50 40 30 20.10 0 10 20 30 40 50 60 70 80 , . 3. | , . . , 5 , 4 , , (. 3). , . . , . , . , . , , - . , . |
, 1 . , . , 1,0.
: , ; .
. , . D (), . V visus (0,1, 0,2, 0,3 . .).
F= d/D,
V , D , , d , . , 5- 5 , 12,5 , 5/12,5 = 0,4.
. 5 . . . , , , . , ( 20 %), . .
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1. .
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2. ,
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3. .