Page 46
Instruction Manual Easygraph
This diagram shows the prevailing value of the axis
position. X-axis: diameter around the apex in mm. Y-
axis: diopter value. It is possible to change the axis of
the section.
Example:
At 173,4° (or 354,4°) is an interrupted blue
line in the picture „Refractive Difference“. By clicking
on this line with the left mouse button a continuous
line appears. This can be made to rotate, and the
values of the axis position in the lower diagram are
changed accordingly.
•
NUM
Clicking on the NUM key causes the refractive
difference map to be divided into several zones. The
mean refractive difference is calculated from the
points measured within that zone ans is displayed in
its center. This value gives the average refractive
difference for the entire zone rather than of a single
point.
•
Color bar
the color bar on the left of the refractive difference
map gives a color scale of refractivity in diopters.
The scale can be changed by clicking with the left
mouse button on the color bar. In this way it is
possible to depict refractivity in smaller or larger
diopter intervals.
•
Apex
In the corner on the bottom left of the pictures 1 and
2 the refractivity at the apex of the two current
refractive measurements is given.
•
Astigmatism
In the corner of the buttom right of the picture 1 and 2
the astigmatism of the two current refractive
measurements is given in diopters.
•
Principal sections
The position of the two principal sections cn be
inferred from the small diagram in the top right-hand
corners. These are per definition always
perpendicular to each other