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Installation, Features, & Functions
Remote Control Functions
Pressing the ILLUM button changes the background illumination of the display. Three
ILLUM
light levels are available for testing: Full illumination (220 cd/m²), Photopic or Standard (85
cd/m²) and Mesopic for low light testing (3 cd/m²).
The CONT button displays the sine wave grating chart for contrast sensitivity testing. This
test is intended as a screening tool for patients who may have difficulty discerning con-
trast. The background illumination defaults to Standard (STD) or photopic at 85 cd/m². In
this mode, the UP/DOWN arrows adjust the frequency of the sine wave grating. There
are five different frequencies: 1.5, 3, 6, 12 and 18 cycles per degree. The number in the
upper right corner displays the frequency. Level of contrast in the sine wave target can be
CONT
adjusted using the MIN and MAX buttons. Contrast can be adjusted to fifteen different
levels: 100, 63, 45, 32, 22, 16, 11, 7.9, 5.6, 4.0, 2.8, 2.0, 1.4, 1.0, 0.7. The lower left num-
ber displays the contrast level by percentage. RIGHT/LEFT arrow buttons can be used to
rotate the image angle. Pressing the CONT button a second time exits this mode.
At each frequency, find the lowest level of contrast at which that patient can see the sine
wave grating on the display. Change the direction of the target using the RIGHT/ LEFT
arrow buttons and ask the patient if the sine waves are aligned straight up and down, to
the right or to the left. Press the UP arrow to change the target to the next frequency.
13785-101 Rev. F
(continued)
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