81
OPERATING PROCEDURE
Chart Presentation
2
2.6.4
Contrast function, Night mode, and Reverse function (SC series)
When the SC series is connected,
and
or
such are displayed below the chart buttons as
shown to the right.
Contrast 25%
: Switches the chart contrast in the order of
25%, 12.5%, 6%, and 100% (normal contrast).
The contrast function makes it possible to
test the visual acuity under low-contrast
conditions (25%, 12.5%, 6%). This func-
tion can evaluate the contrast sensitivity
visual function, which is not measured in
the standard test, and can observe
changes with time.
is shown to the right of the displayed chart on the chart window when the contrast is
25%,
is shown when the contrast is 12.5%, and
is shown when the contrast is
6%.
• Contrast can be tested at any time during refraction.
:Inverses the VA chart each time pressed.
• The inverted VA chart (white letters
in black) is used for the special test
such as amblyopia and VA value is a
reference value.
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Содержание RT-5100
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