Nidek Medical RT-5100, Operator'S Manual

Page: 100 / 306

82
OPERATING PROCEDURE Chart Presentation
: Switches between the low-light illumination and standard light illumination.
(SC-1600 and SC-1600Pola only)
The low-light illumination function makes it possible to test the visual acuity under night-time
conditions. This function can test whether or not the subject can recognize the low-light chart
(9 to 11 cd/m
2
) for reference to diagnose light sense disturbance.
is shown to the right of the displayed chart on the chart window when of the low-light
illumination.
• The low illumination function can be used at any time during refraction.
 Displaying contrast VA chart (SC-17 and SC-16 only)
For the G+ chart of the SC-1700Pola and the SC-1600Pola, the chart with the same visual acuity can
be presented in three contrast levels so that the contrast sensitivity can be compared.
This is used for when visual acuity measurement is performed under low contrast conditions
(25%, 12.5%, or 6%). It allows visual function evaluation by contrast sensitivity and observa-
tion of aged deterioration that is not readily apparent under normal visual acuity measure-
ment.
Press the chart key to be displayed from among to
on the chart control screen.
25%
12.5%
6%
The contrast VA chart appears.
The contrast of each level is displayed by 25% (upper),
12.5% (middle), and 6% (lower).
Press or to change the visual acuity chart.
• In the contrast VA chart, the red-green filter cannot be applied nor can the vertical/
horizontal line isolation or single letter isolation be displayed.
161221687130 承認済
Uncontrolled copy when printed.