Haze in Topcon Images https://www.opsweb.org/forums/posts.aspx?topic=541162 Sat, 13 Jun 2026 08:54:21 GMT Tue, 9 Apr 2013 21:15:45 GMT Copyright © 2013 Ophthalmic Photographers' Society Haze in Topcon Images https://www.opsweb.org/forums/posts.aspx?topic=541162 https://www.opsweb.org/forums/posts.aspx?topic=541162 Take a look at the attached photos, different patients and eyes. I am noticing a white haze that seems to be more vertical in color photos. I do not notice it in FAs. I have cleaned the lens but it doesnt seem to help. What do you think? Scratched lens? Change of filters? Issue with an aging sustem?   I'm at a loss. 

 

]]> Thu, 7 Mar 2013 15:16:58 GMT https://www.opsweb.org/forums/posts.aspx?topic=541180 https://www.opsweb.org/forums/posts.aspx?topic=541180 Hi Sonya,

Take your Diopter adjuster and set it to Minus.

Take your Eye Piece retincle and rotate it hard to the right, minus 4 or 5.

Look through the eyepiece, and at a blank wall, not close up. 

Do you see a patients' nose smudge on the front of that lens?

Jim

]]> Thu, 7 Mar 2013 15:52:20 GMT https://www.opsweb.org/forums/posts.aspx?topic=541185 https://www.opsweb.org/forums/posts.aspx?topic=541185 Thu, 7 Mar 2013 16:01:07 GMT https://www.opsweb.org/forums/posts.aspx?topic=541186 https://www.opsweb.org/forums/posts.aspx?topic=541186 Thu, 7 Mar 2013 16:09:41 GMT https://www.opsweb.org/forums/posts.aspx?topic=541221 https://www.opsweb.org/forums/posts.aspx?topic=541221 Sonya, you can also try to hold something black and non-reflective in front of the lens (e.g. the lens cap).  Hold it steady and align the camera so the illumination "donut" is sharp and take an image.  This will give you an image where only the light reflecting back off the cap illuminates the objective lens - sort of like dark field illumination.  This may help you see if there is perhaps an offending smudge or haze that you can't quite see looking into the objective.

Here is an example focused with the minus in as Jim described and then focused "normally".  I had to collect dust and smudges just to create this photo on our normally pristine lens!  ;)

Despite what lens cleaning solution i use, i almost always have to do a final polish with just breath and a clean micro fiber cloth to remove the remaining haze.  I have used a zeiss optics solution which was very good - but i haven't tried to purchase it in years.

Love those micro fiber clothes as giveaways -hint--hint--hint-

j-

 

]]> Thu, 7 Mar 2013 17:22:22 GMT https://www.opsweb.org/forums/posts.aspx?topic=541223 https://www.opsweb.org/forums/posts.aspx?topic=541223 Sonya,

Is the color sensor on the back port or mounted on a relay lens off the top port? The relay lens is another potential place for smudges/dust/etc.

Just a thought...

]]> Thu, 7 Mar 2013 17:23:28 GMT https://www.opsweb.org/forums/posts.aspx?topic=541228 https://www.opsweb.org/forums/posts.aspx?topic=541228 Just for kix - image of the front of the same lens i posted earlier...just to see what i could see.

Straight on all i could visualize was the dust, way off axis i could see the "subtle" smudges.

I can see the subtle decrease in reflectiveness that makes me highly suspicious that they're on the front surface...but either way it needs attention. Excuse now while i clean MY lens,

j-

]]> Thu, 7 Mar 2013 17:35:01 GMT https://www.opsweb.org/forums/posts.aspx?topic=541704 https://www.opsweb.org/forums/posts.aspx?topic=541704 Sat, 9 Mar 2013 11:46:05 GMT https://www.opsweb.org/forums/posts.aspx?topic=543291 https://www.opsweb.org/forums/posts.aspx?topic=543291 White or blue-white flare is almost always caused by stuff on the objective lens.  Most artifacts in other parts of the optical path appear DARK.  The best way to check the objective lens is to:

-turn illumination slide to max

-turn filter wheel to N (or another empty slot)

-turn to myopic (minus) setting

-turn OFF room lights

-look through eyepiec- see if the glop changes size when you change magnifications

You will be able to focus on any glop on the objective.  The photos you included look like faint nose grease, which has been mostly removed.  If you can confirm the problem is on the objective, you will probably need several applications of a solvent (acetone or methanol) to dissolve and remove the grease.

 The only other place I have seen white flare is on Topcon 50VT's, and is only visible on 35 and 20 degrees (not 50).  If you have a VT AND you have ruled out the objective lens properly, give me a call and I will walk you through it.

 Marty Rothenberg

Angiographics, Inc 617-797-5067

]]> Wed, 13 Mar 2013 21:05:34 GMT Haze in Topcon Images https://www.opsweb.org/forums/posts.aspx?topic=558321 https://www.opsweb.org/forums/posts.aspx?topic=558321 One other possibility, that I do not believe was mentioned, is that either an internal mirror or the top surface of the condenser lens, in the illumination lamp light path, have deposits on them.  This is a common issue, though wide angle cameras seem more sensitive to it.  

Fundus cameras get hot during use, both from the strobe tube and the illumination lamp.  This causes plasticizers to vaporize off components within the fundus camera.  Cooling fans draw outside air in as well.  This introduces dust or other contaminants from the room air.  This stuff contributes to development of a fine haze on optical surfaces. 

When was your fundus camera last serviced?  If it is more than 2 years ago it might be time to arrange a service call.

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