Essilor Instruments Vision-R 800, User Manual

Page: 67 / 91

8. Visual acuity format
Defines the visual acuity unit, notation:
◦ Decimal (x/10)
◦ Snellen in meters (6/x)
◦ Snellen in feet (20/x)
2 - Page "Distance"
1. Unit distance
Define the default distance unit:
◦ in cm
◦ in inches
◦ in diopters
2. Far exam distance
Define the test presentation screen distance.
To modify this distance move the cursor to the left or the right (steps from 25 cm to 3m to 8m).
3. Generation of personalized optotypes
4. Near exam distance
Defines the distance of the near-vision test.
> The values indicated correspond to a default setting in cm.
5. Vertex Distance (in mm)
Sets the lens-eye distance by default taken into account for the conversion of the refraction value of a
standard reference distance.
U
SER MANUAL
> V. I
NSTRUMENT SETTINGS
71
Vision-R 800 - Essilor automatic phoropter > V1 - 12-2018