Vertical Decentration - OCULUS Easygraph 70620 Instruction Manual

The large map at the top left shows vertical
decentration calculated according to a Fourier
analysis of height data. Combining the spherical
component with the vertical decentration component
(both generated from height data) makes it possible
to depict the development and different degrees of
severity of keratokonus.
Example:
Normal eye
Possible KK
Stage 1 KK
Stage 2-3 KK
Instruction Manual Easygraph

7.5.2.6.1 Vertical Decentration

Possible KK
Stage 1-2 KK
Stage 3 KK
In normal and astigmatic eyes as well as in near-
central keratoconus
perfectly
keratoconus the rings gradually open up due to the
concomitant decentration, finally taking on the shape
of an inverted omega in the center.
Astigmatic eye
Incipient KK
Stage 2 KK
Stage 3-4 KK
this display
closed rings. In the
Incipient KK
Stage 4 KK
Page 39
mode yields
transition to