Hello everyone.
Are there any resources explaining how Pentacam calculates Zernike coefficients of the cornea?
Newer Pentacam devices use Hartman-Shack technology to perform wavefront aberrometry and obtain total corneal and internal aberrations.
Thank you very much, Gustavo.
That's helpful to know.
Using Pentacam elevation data, I'm attempting to obtain Zernike coefficients by raytracing simulation. My results still differ by 25% from what the device reports.
Should you have any resources to help me get more accurate values, I would greatly appreciate it.
Regards
Payman.
I have asked the manufacturer OCULUS. The statement is:
„Zernike coefficients can be calculated from optical models via ray tracing. The optical model from the cornea consist of the individual measured corneal surfaces and pachymetry using Scheimpflug technology.”
Mario Rehnert, thank you very much.
That's a good point.
For the ray-tracing, I used the 'front' and 'back related to front' data from the elevation file rather than the pachymetry data. After your comment, I used pachymetry data, which improved my results.
However, there is still a total of 20% difference between the extracted coefficients and the coefficients provided by Pentacam.
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