227
21 Point Exams (only for Plus Package)
21 Point Exams (only for Plus Package)
5
5.2.14 Near point of convergence (NPC)
This test does not require the refractor. Let the patient wear his/her glasses when he/her wears
them usually.
Chart: Fixation like a tip of a pen which causes double vision easily.
[Procedure example]
1
Press [NPC].
2
Gradually bring a fixation like a tip of a pen closer to the patient’s eyes and measure the
distance from the pen tip to the root of the nose (posterior surface of the lens) at the point
where the image appears dissociated (split in two).
3
Enter the distance with the dial.
Also possible by pressing
or
.
It is possible to enter the distance from 1 to 100 cm in 1 cm increments.
The meter angle (MA) and prism power are calculated and displayed automatically.
For example: Enter 7 cm as the distance when PD = 6.4 cm.
1) When the “NPC calculation” parameter is set to “Detail”:
MA = 1/(0.07 + 0.025) = 10.5
= MA × 6.4 = 67.4
NPC = 7 cm: 10.5 MA, 67.4
2) When the “NPC calculation” parameter is set to “Simple”:
MA = 1/0.07 = 14.3
= MA × 6.4 = 91.4
NPC = 7 cm: 14.3 MA, 91.4
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Содержание RT-5100
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