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Installation, Features, & Functions
Remote Control Functions
Errors in Plates 12 –14 but not in 15 –16 indicate Medium Red/Green Defect. Errors in
Plates 15 –16 indicate Strong Red/Green Defect.
COLOR
(cont.)
Errors in Plates 17 – 18 but not in Plates 19 –12 indicate Medium Blue/Yellow defect. Er-
rors in Plates 19 –20 indicate Strong Blue/Yellow Defect.
PLATE
The PLATE button displays images of License Plates for vision
testing. The license plate images follow European standards for
letters, fonts, numbers and dimensions. Press the RIGHT arrow
button to display the different plate images. Press PLATE a sec-
ond time to EXIT this mode.
MAX and MIN buttons are used during the initial set-up of the ClearChart 4P to enter the
MAX/
refracting distance and adjust red/green colors for filters and suppression tests. These
MIN
buttons are also used to adjust contrast levels of the sine wave grating chart for contrast
sensitivity testing, and to adjust contrast levels of optotypes.
The ETDRS button accesses optotypes with sloan letters and logmar progression that
meet specific standards for ETDRS testing. Three standard ETDRS charts are avail-
able by pressing the RIGHT arrow button. The UP and DOWN arrow buttons will scroll
ETDRS
to larger or smaller optotype sizes in the chart. Press ETDRS again to escape the chart
sequence.
13785-101 Rev. F
(continued)
Normal
Protanopia
Plate 12
O
Plate 13
O
Plate 14
X
Plate 15
O X
Plate 16
O
Normal
Tritanopia
Plate 17
X
Plate 18
O X
Plate 19
O
Plate 20
X
(continued)
Deutanopia
Tetartanopia
31
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