13795-101 Rev. F
28
MIN
Press the Contrast MIN button to decreases the contrast of the opto
character or the sine gratings in the contrast sensitivity mode.
Note:
RED/GREEN tests will only display maximum contrast
letters even if less than maximum contrast is selected.
LIGHT
Pressing the LIGHT button changes the illumination of the screen.
There are three light levels available for testing: full illumination (220
cd/m
2
), photopic (contrast sensitivity standard, 85 cd/m
2
), mesopic
(contrast sensitivity low light test 3 cd/m
2
).
Note:
Unit should be illuminated for 10 minutes prior to photopic and
mesopic testing.
CONT
Pressing the CONT button activates the frequency grating, contrast
sensitivity mode. When in the CONT mode, the UP/DOWN arrows
adjust the frequency, the RIGHT/LEFT arrows rotate the image angle,
and the MIN/MAX buttons adjust the level of contrast. In this mode
the number in the upper right corner displays the frequency, and in
the lower left the contrast level by percentage. Pressing the CONT a
second time exits this mode.
Note:
Contrast adjustment is only available in the ClearChart 4X.
SIZE
100
SIZE
BUTTONS
Each button is labeled with a line size and when pressed, will display
the current optotype at that size. Pressing the same button again will
randomize the optotype at that current size.
OPTO
Pressing the OPTO button will toggle through the different optotypes.
Note:
Toggling through optotypes at large line sizes might prevent
the viewing of the Allen Symbols.
ALT OPTO
Pressing the ALT OPTO button will display the alternate optotype
selected during the initial setup or in the Menu screen.
ANIM
Pressing the ANIM button will animate the current optotype. Press
the ANIM button a second time to stop the animation.
MOVIE
Pressing the MOVIE button will run an animated movie for pediatric
focusing. Use the UP/DOWN arrows to adjust the volume. Press the
MOVIE button a second time to exit the movie.
Installation, Features, & Functions
(continued)
Remote Control Functions
(continued)
