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Published in: Graefe's Archive for Clinical and Experimental Ophthalmology 1/2011

01-01-2011 | Retinal Disorders

The effect of laser unit on photodynamic therapy spot size

Authors: Siamak Ansari-Shahrezaei, Susanne Binder, Michael Stur

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 1/2011

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Abstract

Background

To determine the effect of the laser unit on photodynamic therapy (PDT) spot size.

Methods

A calibrated Gullstrand-type model eye was used for this study. The axial length of the model eye was set to different values ranging from 22.2 to 27.0 mm, and the actual spot size from the laser console was recorded for treating a spot of 4 mm in the center of the artificial fundus using two different laser units (Coherent Opal laser; Coherent Inc, Santa Clara, California, USA and Zeiss Visulas laser; Carl Zeiss Meditec Inc, Dublin, California, USA) and two indirect contact laser lenses (Volk PDT laser lens and Volk Area Centralis lens; Volk Optical Inc, Mentor, Ohio, USA).

Results

From myopia to hyperopia, the total deviation from the intended spot size was –22.5% to –7.5% (Opal laser and PDT laser lens), and –17.5% to +2.5% (Visulas laser and PDT laser lens), –12.5% to +7.5% (Opal laser and Area Centralis lens), and –7.5% to +10% (Visulas laser and Area Centralis lens).

Conclusions

The used laser unit has a significant effect on PDT spot size in this model. These findings may be important for optimizing PDT of choroidal neovascular lesions.
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Metadata
Title
The effect of laser unit on photodynamic therapy spot size
Authors
Siamak Ansari-Shahrezaei
Susanne Binder
Michael Stur
Publication date
01-01-2011
Publisher
Springer-Verlag
Published in
Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 1/2011
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI
https://doi.org/10.1007/s00417-010-1460-4

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