Nidek Medical RT-5100, Operator'S Manual

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71
OPERATING PROCEDURE Standard Program Refraction
2
13
Measure the best possible visual acuity for both eyes.
1) Press .
The isolated 20/20 line is presented.
2) Check the best possible visual acuity
with or .
3) Refine the spherical power to achieve
the best possible visual acuity with
most plus power.
Turn the dial counterclockwise to add
approximately SPH +0.25 D. When the
chart appears blur, turn the dial clockwise
one increment.
The spherical power for both eyes is perfectly refined.
• Instead of the above procedure, the best possible visual acuity for both eyes can be
determined as follows:
When releasing the fogging, give the patient sufficient time to view the VA chart.
(1) Add approximately SPH +0.75 D of fogging.
(2) Present a visual acuity chart for which the visual acuity is decreased by a few increments.
(3) When the patient can read the VA chart, press to increase the visual acuity. When
they cannot read the chart, add SPH -0.25 D to release the fogging and ask them to read it
again.
Repeat the procedure to determine the best possible visual acuity with the most plus power.
14
Select whether the near vision test is performed or not.
1) Press .
The "Near Vision test?" message appears.
2) Select whether the near vision test is
performed or not.
Perform the near vision test.

Select [Yes]. The cross cylinder lenses
are placed and near point lamp lights up.
Cancel the near vision test.

Select [No]. Program A is finished. Go to
Step 28.
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