Photobleaching https://www.opsweb.org/forums/posts.aspx?topic=1319126 Sun, 19 Jul 2026 13:16:39 GMT Fri, 16 Dec 2016 19:08:29 GMT Copyright © 2016 Ophthalmic Photographers' Society Photobleaching https://www.opsweb.org/forums/posts.aspx?topic=1319126 https://www.opsweb.org/forums/posts.aspx?topic=1319126 I have pondered the JAMA Ophthalmology article "Photobleaching by Spectralis Target"

in the September issue for awhile.  Thirty eyes of fifteen young (AVG 24) healthy volunteers

were exposed to 9.7 seconds of SD OCT with Spectralis. Following the faux exam, ALL eyes

demonstrated a cross shaped increase in macular autofluorescence on FAF/BAF.  The

cross was visible on infrared and multicolor.  Variable intensity of the image.  Disappeared

after ten minutes.  Not reproducible with Cirrus and Avanti at increased exposure times.

I AM NOT KIDDING. 

 

So...is this significant  for interpretation.  Retina here unimpressed.  Take a look.

I would be interested to know what our photobleaching experts (You know who

you are) think.  I have resisted all "sign of the cross" references.

 

  Kirby

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I might have to do a selfie or two on the Spectralis to see if our fixation light has the same bleaching effect.]]> Thu, 15 Dec 2016 22:18:48 GMT https://www.opsweb.org/forums/posts.aspx?topic=1319530 https://www.opsweb.org/forums/posts.aspx?topic=1319530 I took a close look at some of our images today and also did some additional testing. No sign of a bleaching artifact on any of our FAF images. But again our units have a single dot internal blue fixation light.

Earlier this year we had a loaner unit from Heidelberg for about 6 weeks. It had the cross-shaped internal fixation light and several of our regular patients commented on it being brighter than our usual one. I was curious to see if I could find evidence of the cross artifact in images taken with that loaner unit and went back and identified all FAF images taken with that unit, Again, I don't see any bleaching artifacts.

Below is an FAF image from that unit taken right after extensive OCT imaging using the cross shaped internal fixation light.

I'm wondering if the authors of the article had a device with a fixation light that's abnormally bright?

 

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