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Help me identify my eye defect

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#1 Richard Turner

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Posted 28 July 2021 - 09:33 PM

I am a 66 year old amateur of some years of experience. Of late I have been seeing an artifact in my vision which appears over the image of a defocused star. The attached drawing shows an out of focus star with the usual central secondary shadow. The visual artifact looks like a bat with its wings extended. When I rotate my head, the artifact rotates. I do have cataracts and the vitreous humor has detached from my retina, but no retinal tears. Anyone seen anything like this before? It's not floaters, because the artifact doesn't move around like floaters do. 

 

Thanks,

 

Richard

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#2 jmiller1001

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Posted 28 July 2021 - 09:39 PM

Is the artifact only present when doing astronomy or is it always present?


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#3 Bill Weir

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Posted 28 July 2021 - 09:51 PM

Huh? I’m a retired nurse and whenever someone would come to me describing symptoms and wanting a diagnosis my answer was always the same.

 

“What does your Doctor say?”

 

Bill


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#4 barbarosa

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Posted 28 July 2021 - 09:56 PM

Richard I will speak bluntly. It is beyond foolish for you to seek opinions on the internet about your vision.  It would be dangerously irresponsible for any of us without professional and appropriate education and experience to offer an opinion.

 

You have two medical eye conditions already, as do many of us as we age. So my advice and I think it might be the only advice that any us of should offer, is talk to a qualified medical person, a doctor of Ophthalmology or doctor of optometry who can make a proper evaluation and refer you if necessary.


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#5 bsturges

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Posted 28 July 2021 - 10:43 PM

Richard, according to one of your statements, you must have seen an eye doctor some time in the past. I know that at our age, time can pass quickly and it can suddenly become several years between needed exams. The digital retinal imaging scan is now a very important tool. When you get scanned, this will have a range of important diagnostics- including any new retinal detachment, as well as melanoma (which can be signaled by a dark spot at the back of the eye and is treatable). The visit should at least give you peace of mind going forward, and you can also request the images be emailed to you for future comparison or referral to another doctor in the future. 


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#6 MeridianStarGazer

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Posted 28 July 2021 - 11:03 PM

I am a 66 year old amateur of some years of experience. Of late I have been seeing an artifact in my vision which appears over the image of a defocused star. The attached drawing shows an out of focus star with the usual central secondary shadow. The visual artifact looks like a bat with its wings extended. When I rotate my head, the artifact rotates. I do have cataracts and the vitreous humor has detached from my retina, but no retinal tears. Anyone seen anything like this before? It's not floaters, because the artifact doesn't move around like floaters do. 

 

Thanks,

 

Richard

Do you see a dark spot in your daytime vision, or is that the pattern a star stretches to? If that is a star pattern, it is likely astigmatism caused by the cataract preventing your lens from changing shape correctly. If you see it during the day time, it might be macular degeneration or a large floater that stays close to the same spot right in front of the retina.

 

I have a large floater in front of my right retina just off center. I sometimes think a mosquito is hovering 2 feet in front of me. It moves to wherever I look. Might be damage and not a floater.

 

I also have astigmatism and have seen star patterns similar to yours on axis, though mine are more complex. I don't notice it on a defocused star. Only on focused stars, which I can't fully focus myself.

 

An eye doctor can tell you for sure. Worth going to rule out macular degenation or damage. Not all floaters float.

 

You can also test for astigmatism by looking at high contrast lines and rotating them, looking for blur. But the start test is far more informative.

 

 

...

 

Edit: Definitely get examined for melanoma. I need to get seen for that too. I'll make an appointment tomorrow. I really hope that is not what that is.


Edited by MeridianStarGazer, 28 July 2021 - 11:06 PM.


#7 siriusandthepup

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Posted 28 July 2021 - 11:11 PM

Ask your friends for the name of a respected local ophthalmologist.

 

Time for a full fledged eye exam. Not a glasses prescription!

 

The doctor will identify your issue.

 

It is always good to know what's going on for real, instead of worrying and unproductive speculation.

 

Do it tomorrow. Call them for a soonest appointment.

 

Good luck, buddy!

 

I have an appointment in September. Received cataract replacement lens installation 2 years ago. Now I have a slight mystery veil in the left eye. My doc said that this could occur when I had the cataract procedure and not to worry too much if it did. He said that he had a laser "touch up" procedure.

 

BTW - the cataract lens replacement was my best quality of life and astronomy upgrade, ever!


Edited by siriusandthepup, 28 July 2021 - 11:20 PM.

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#8 MeridianStarGazer

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Posted 28 July 2021 - 11:13 PM

I am a 66 year old amateur of some years of experience. Of late I have been seeing an artifact in my vision which appears over the image of a defocused star. The attached drawing shows an out of focus star with the usual central secondary shadow. The visual artifact looks like a bat with its wings extended. When I rotate my head, the artifact rotates. I do have cataracts and the vitreous humor has detached from my retina, but no retinal tears. Anyone seen anything like this before? It's not floaters, because the artifact doesn't move around like floaters do. 

 

Thanks,

 

Richard

Interesting what the defocused start reveals. I really want to figure out what it is doing. So I take it you are able to see pin point stars when focused. Then this is not astigmatism.

 

When you look into the eyepiece, does the artifact stay in the defocused star even as you look around the field, or does it move left and right with your eye, leaving the star? I don't know if my question is even a logical one.

 

Is the artifact black or just dimmer than the rest of the light?

 

What happens when you pan the star across the field?

 

Do you see it with averted vision and in the same place?



#9 MeridianStarGazer

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Posted 28 July 2021 - 11:14 PM

Ask your friends for the name of a respected local ophthalmologist.

 

Time for a full fledged eye exam. Not a glasses prescription!

 

The doctor will identify your issue.

 

It is always good to know what's going on for real, instead of worrying and unproductive speculation.

 

Do it tomorrow. Call them for a soonest appointment.

 

Good luck, buddy!

I agree about seeing the doctor. I still want to figure out though how this light show is happening. Hopefully TOMEDY finds this thread.



#10 TOMDEY

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Posted 28 July 2021 - 11:27 PM

Hi, Richard!

 

That sketch is good to journal as well as any other observations... especially changes.

 

You've confirmed that it is indeed associated with your eye, not the telescope or eyepiece by the rotation of your head... it rotates with your head. Note that the viewing condition highlights your eye's pupil-space (exit pupil conjugate upon your eye's pupil), so that could be consistent with your cataract projecting onto your retina, under that quasi-schlieren illumination configuration.

 

Especially useful is to compare with your other eye. If those manifest differently, that helps the doctor troubleshoot what's the cause.

 

Although your cataract progression may be typical for your age, it is still considered to be a geriatric abnormality and worth continued, periodic monitoring. The doctor is likely to suggest/recommend addressing it when it becomes annoying or (especially) debilitating.

 

As you shared, the detached vitreous is normal and expected at your age, provided it did not damage or tear the retina.

 

It's obviously time to revisit the doctor and have him monitor the changes you are experiencing. As you undoubtedly already know, perceived flashes of light, visual occlusions, etc. are all indicators that it's time to make the call. "Changes in vision" get their attention and an early appointment.    Tom


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#11 siriusandthepup

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Posted 28 July 2021 - 11:30 PM

Probably, Richard will be able to explain it to us after the Doctor tells him what is the deal with his eye. Knowing what's going on inside will help formulate and explain the observed light/diffraction/optical anomaly.

 

cat24.gif


Edited by siriusandthepup, 28 July 2021 - 11:30 PM.


#12 MeridianStarGazer

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Posted 28 July 2021 - 11:33 PM

I see green flashes of light now and then. Well, rarely. But several times in the last 5 years. I know that means something pulling on the retina, hopefully just detaching gel.



#13 Richard Turner

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Posted 29 July 2021 - 02:11 AM

Lots of helpful replies. I've seen my eye doctor twice in the last four months. I was seeing tiny dark spots in my daytime vision. The doctor confirmed that the cause was the vitreous detaching from my retina. No evidence of a tare was seen. I see less of the dark spots these days. He called my cataracts "moderate" in progression. On a tightly focused star, I don't see the artifact. And I do have some astigmatism. I think another visit to the eye doctor is in order. Cataract surgery might be his recommendation. 

 

Thank you all,

 

Richard


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#14 jmiller1001

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Posted 29 July 2021 - 09:20 AM

@Richard Turner - yep, I had the same symptoms (dark spots) with my PVD (post-vitreous detachment) - although I got hit in the eye with a tennis ball (not age related). :-(

 

I do notice "artifacts" when the focal plane of my telescope is not hitting my retina - that may be what you are experiencing.  But, like many posters here, I don't mess with my eyes - when I notice a change, I'm off to the ophthalmologist. 

 

Good luck!   


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#15 khingdheano

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Posted 29 July 2021 - 10:53 PM

Detaching gel is bad. You could end up with a giant floating mess in your eye if you don't have this addressed. I KNOW! Been through it all. A retina specialist can deal with that with a laser. 

 

I see green flashes of light now and then. Well, rarely. But several times in the last 5 years. I know that means something pulling on the retina, hopefully just detaching gel.


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