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Prism Units
• X/Y coordinates
(Base In, Base Out, Base Up, Base
Down)
• Polar (Polar coordinates)
Retinoscopy
• 1.5 D
• 2.0 D
Fog Amount
Select the amount of auto-fogging preferred:
• +0.50D
• +0.75D
• +1.00D
• +1.50D
• +2.00D
BB Fog Amount
Select the amount of auto-fogging preferred for
the Binocular Balance Test
• +0.50D
• +0.75D
• +1.00D
• +1.50D
• +2.00D
• None
VA Up Arrow
• Improves VA: Tap
VISUAL ACUITY UP
to improve visual acuity.
• Increases Size: Tap
VISUAL ACUITY
UP
to increase the size of the Optotype
(decrease Visual Acuity).
NRA/PRA Order
• NRA/PRA: Find the upper limit (increase plus),
then the lower limit (decrease plus).
• PRA/NRA: Find the lower limit (decrease plus),
then the upper limit (increase plus).
Near Chart Units
• Snellen
• Decimal
Binocular Only
Leaves both eye apertures open during
all far vision tests when selected to ON.
CC Button
• Final
• REF
Subj Overwrite Protection
• On - Attempting to start a subjective refraction
using existing AR, LM, or REF data will NOT
copy that data if there is already subjective
information. A warning will be displayed
indicating the Subjective data is protected.
• Off - Attempting to start a subjective refraction
using existing AR, LM, or REF data will copy
that data to the Subjective dataset, overwriting
any existing Subjective data.
WARNING:
If set to “Off”, any attempted modification
of the above datasets will overwrite existing refrac-
tion data. If switching between datasets to allow the
patient to compare prescriptions, do not modify the
data or the Subjective refraction data will be over-
written.
Instrument Setup
(continued)
Settings
(continued)
Settings Options
(continued)
35
16243-101 Rev. G
Summary of Contents for VISUTRON 900 Touch
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