OCULUS Easygraph 70620 Instruction Manual page 26

Page 26
When the [Tilt] or [Turn] buttons are activated, a
calculation of the animation process is first carried
out, then the image of the cornea is shown in motion.
The [Wide Narrow] slide bar adjusts the extent of
the movement; the other slide bar [Slow Fast]
adjusts the speed of presentation.
The animation process is stopped by clicking with
the mouse.
The type of presentation can also be changed by
means of the following four screen buttons:
[Color], [Red/Green], [Realistic], [Curvature]
• Color
The display is presented in the form of a filled-out
contour model. The
designates the local radius of curvature of each
location.
• Red/Green
The display is presented in the form of a wire-
frame representation. When wearing red-green
spectacles the viewer sees a true 3-dimensional
view of the display.
• Realistic
The actual geometric form of the corneal surface
is displayed, if the slide bar [Exaggerate] is
moved completely to the left, what means the
exaggeration function is disabled. Moving the
slide bar to any other position causes an
exaggeration of the elevation between the cornea
and a reference body (ellipsoid of revolution).
Instruction Manual Easygraph
color of the surface
The display of the cornea image can also be
changed as follows:
The display of curvature can be intensified or
attenuated with the [Exaggerate] slide bar.
The exaggerated display permits better recognition
(e.g. of mild astigmatism).
This simplifies the
Astigmatism, Keratoconus,...
• Curvature
The local height of the image displayed (i.e. the
3rd dimension) corresponds to the level of the
curvature. The image
illustrates the curvature profile quite well, since
any differences in curvature which may be
present in the measured cornea (e.g.
astigmatism or keratoconus) make a stronger
visual impression than in the realistic display,
especially if the intensity is set to "Maximum".
However, the display does not correspond to the
actual contours of the surface (e.g. a globe
appears as a flat surface, since curvature is
everywhere the same.)
Note: ⇒ The different forms of presentation can be
used simultaneously, e.g. it is possible to display a
left-rotating, intensified image of curvature in red /
green and in movement.
identification of e.g.
resulting from this
in