Criteria for the determination of the 'thermal' retinal spot diameter

Karl Schulmeister; Bernhard Seiser; Florian Edthofer; Ulfried Grabner; Georg Veiss

doi:10.1117/12.608421

18 April 2005 Criteria for the determination of the 'thermal' retinal spot diameter

Karl Schulmeister, Bernhard Seiser, Florian Edthofer, Ulfried Grabner, Georg Veiss

Proceedings Volume 5688, Ophthalmic Technologies XV; (2005) https://doi.org/10.1117/12.608421
Event: SPIE BiOS, 2005, San Jose, CA, United States

Abstract

For a given power entering the eye, the level of retinal thermal hazard depends on the retinal image size over which that power is distributed. Maximum permissible exposure limits are given in terms of the angular subtense of the apparent source α, which describes the diameter of the retinal image. Since this parameter scales the retinal thermal exposure limits (MPE), it is a direct measure of the relative thermal hazard of different retinal images, and thus should be seen as 'thermally effective' rather than 'optical' diameter of the retinal image. From the method given in IEC 60825-1 for the analysis of non-uniform sources, a general method for the analysis of non-top hat profiles was derived and is suggested as general analysis method for the angular subtense of the apparent source for a given image. This and other criteria are compared with the results of thermal models.

Citation Download Citation

Karl Schulmeister, Bernhard Seiser, Florian Edthofer, Ulfried Grabner, and Georg Veiss "Criteria for the determination of the 'thermal' retinal spot diameter", Proc. SPIE 5688, Ophthalmic Technologies XV, (18 April 2005); https://doi.org/10.1117/12.608421

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