Keratron
™
Onda Installation and operating manual
OPTIKON 2000
Cod. 161401EN
7-23
2015-03-27
Rev.C
When as in Figure 7-39, you select [
High Order
], the corneal and ocular
aberrometries are displayed, with the image limited to the orders of the Zernike
polynomials from the third to the seventh order (
3
3
c
,
1
3
c
……
5
7
c
,
7
7
c
).
Figure 7-39: Corneal and ocular aberrometries of the high
orders of the Zernike polynomials
Similarly [
Low Order
] displays only the lower orders of the Zernike polynomials
(
2
2
c
,
0
2
c
and
2
2
c
), or sphere, cylinder, and axis.
[
High+Astigmatism
] groups together in the image all of the high orders plus the
two coefficients representing astigmatism (
2
2
c
and
2
2
c
).
[
All orders
] adds to the previous image also the coefficient regarding
defocus
(
0
2
c
).
Figure 7-40: Aberrometries of Figure 7-39 with verification
of the absence of discontinuity in the calculation of the gradients
Double
clicking
in the
wavefront
window allows us to verify that the gradients are
reconstructed correctly. If, like in Figure 7-40, there are no discontinuities inside the
pupil (yellow circle), their reconstruction is correct. Instead the
Ocular WA
map in
Figure 7-41 is suspicious, because the wavefront sensor image contains a corneal
reflection and fogging.
