Commentaires sur : Centering corneal based refractive surgery

Par : Dr Damien Gatinel

Dr Damien Gatinel — Sat, 23 Jun 2018 09:23:47 +0000

En réponse à Noppakun Supannatad. No, since the entrance pupil is not even centered on the limbus in the vast majority of human eyes!

Par : Noppakun Supannatad

Noppakun Supannatad — Fri, 08 Jun 2018 07:39:59 +0000

Dear,

Should we ever center on to the limbus?

Par : Dr Damien Gatinel

Dr Damien Gatinel — Fri, 01 Jul 2016 20:39:49 +0000

Thanks for your kind comment. The line starting form E (center of the entrance pupil), and which connects with the fixation target is the line of sight. The line in red is the keratometric axis, which indicates the vertex apparent location at the corneal plane (first Purkinje image). The line starting from the nodal points is the the visual axis, which forms with the pupillary axis (not shown) the Kappa angle.

Par : Dr Dilip Gaitonde

Dr Dilip Gaitonde — Fri, 01 Jul 2016 20:06:26 +0000

Dr Gatinel , hats off to you for sparing time and effort to explain such a complex issue. I had to read it four times to get a grasp of what you were saying. I have however one doubt. In the second last diagram showing cross section with various axes I have presumed that the axis starting from E is pupillary axis and the one passing through N is visual axis. So the axis in red should be the line of sight as it indicates the vertex which is nasal to other points. Then why does the line of sight start from behind the lens when it should start from the centre of the entrance pupil ?

Par : Francesco lanzafame

Francesco lanzafame — Mon, 28 Mar 2016 14:54:09 +0000

Grazie! Molto chiaro e istruttivo