I am an Eye Surgeon with visual optics interests.
You probably know that in Excimer laser refractive surgery (known as LASIK), we reshape the anterior surface of the eye (cornea) to modify its refractive power into a desired target.
Simplified, eye has two thick lenses and two distances (between the lenses and from the distal lens to the retina). But this arrangement is far more complex. One its complexities lie in non-coaxialities of the reference axes of the lenses, retinal center & its diaphragm (the pupil).
Complexities are reflected on the anterior corneal surface as multiple reference points: vertex, pupil centroid equivalent & many more like geometrical center and apex.
For the purpose of this discussion, there is still serious controversy as to which of the points of 'vertex' or 'centroid' should be chosen for the laser centration.
I have some ideas to address this remarkable debate in ophthalmology and want to know if simulation n modeling thru Zemax can help solving this issue?