[optimal] Re: artifact issue
- From: "George Henry, CRA, PBT" <ghenry@xxxxxxxxxxxxxx>
- To: <optimal@xxxxxxxxxxxxx>
- Date: Tue, 26 Nov 2013 11:37:42 -0600
Think about the optics, folks. anything in the image path on the patient
("forward") side of the magnification lenses WILL change size and apparent
position as you change magnification. Only spots BEHIND the magnification
lenses will stay the same size, and in the same position, regardless of
magnification setting.
My money is on the lower relay lens. I bet somebody blew on it to remove
some dust, and got some spit on it. That, or the camera sensor itself.
George E. Henry, CRA, PBT
Wheaton Eye Clinic, Ltd.
2015 N. Main Street
Wheaton IL 60187
630.588.3615
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From: optimal-bounce@xxxxxxxxxxxxx [mailto:optimal-bounce@xxxxxxxxxxxxx] On
Behalf Of Verdick, Randall E
Sent: Tuesday, November 26, 2013 10:11
To: optimal@xxxxxxxxxxxxx
Subject: [optimal] Re: artifact issue
The images look like spots on the lens, but it could be an external light
reflection from a ceiling light or other light. I would try a good lens
cleaning, and check for room light reflections??
Randall Verdick, FOPS
Educational Media Coordinator
Department of Ophthalmology
University of Iowa
From: optimal-bounce@xxxxxxxxxxxxx [mailto:optimal-bounce@xxxxxxxxxxxxx] On
Behalf Of Darrin Landry
Sent: Monday, November 25, 2013 6:29 PM
To: optimal@xxxxxxxxxxxxx
Subject: [optimal] artifact issue
Optimalers:
I have a practice with an artifact problem. They are using a Topcon 50X
camera.
At first blush it looks like a typical tears on the objective lens issue,
but fervent cleaning of the lens didn't fix the problem, and it can't be
viewed either from the front or through the minus diopter lens setting. I
have asked 5 times if they are sure they cleaned the lens well.
I am assuming it's something on the objective lens, as it's a white
artifact (I am troubleshooting this over the phone, as they are very rural,
and no chance I will be in their neck of the woods anytime soon. If I am,
something has gone terribly wrong in my career).
I am thinking it's on the anterior surface of the objective lens, but it's
not easy talking someone through dismantling the objective lens over the
phone. Changing filters, magnification and focus doesn't change the
appearance of this artifact. This came on rather sudden as well- not a slow
growing problem.
I have attached the example they sent me- if anyone has any ideas, thoughts,
etc, I welcome your input.
Thanks in advance
Darrin
Darrin Landry, CRA, OCT-C
Bryson Taylor Inc.
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