Essilor MYOPIA EXPERT 700, User Manual

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14.5.1 DIFF-Differential
By tapping the “DIFF” button in comparison mode, the user
switches to differential mode (Fig.50).
Fig. 50
In this section, it is possible to see the differential map between the current exam and the exam selected
by the user.
Under the maps found at the top left and top right, there are the main indexes of the respective maps.
Above the differential map, four differential values appear after tapping on the differential map:

P
: is the difference between the dioptric power;

r:
is the difference between the radii of curvature;

d
: is the distance of the cursor from the centre of the image;

g
: is the angle of the cursor from the baseline.
The user can change the step of the differential map by tapping on the two arrows next to the step label.
Press the “COMP” button to go back to comparison mode.