Retinal thermal laser damage thresholds for different beam profiles and scanned exposure

Karl Schulmeister; Reinhard Gilber; Bernhard Seiser; Florian Edthofer; Johannes Husinsky; Beate Fekete; Letizia Farmer

doi:10.1117/12.768671

11 February 2008 Retinal thermal laser damage thresholds for different beam profiles and scanned exposure

Karl Schulmeister, Reinhard Gilber, Bernhard Seiser, Florian Edthofer, Johannes Husinsky, Beate Fekete, Letizia Farmer

Proceedings Volume 6844, Ophthalmic Technologies XVIII; 68441L (2008) https://doi.org/10.1117/12.768671
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

A computer model was used to predict thresholds for 532 nm scanned retinal exposure and exposure for different retinal beam profile geometries, including rectangles and ring shaped profiles. The image analysis method described in IEC 60825-1 Edition 1.2--maximizing the ratio of power within a rectangle over the value of &agr; for this rectangle--was applied to the different profiles to determine &agr; and the fractional power that would be compared to the MPE value. The predicted thresholds for these special types of retinal exposure were compared with the predicted damage threshold for top hat profiles for the value of &agr; that resulted from the image analysis method. The comparison shows that the most restrictive power/&agr; ratio method produces appropriate results, provided that a time dependent &agr;max is used, as was proposed at BIOS 2006.

Citation Download Citation

Karl Schulmeister, Reinhard Gilber, Bernhard Seiser, Florian Edthofer, Johannes Husinsky, Beate Fekete, and Letizia Farmer "Retinal thermal laser damage thresholds for different beam profiles and scanned exposure", Proc. SPIE 6844, Ophthalmic Technologies XVIII, 68441L (11 February 2008); https://doi.org/10.1117/12.768671

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available