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Old Tuesday 8th August 2017, 11:25   #1
arran
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Wearing glasses and binoculars

I started wearing glasses with a moderate astigmatism correction in both eyes of - 75
I have always been using my bins without glasses with no issues at all
After using my noctivid for a while I started comparing the image-quality with and without glasses
I was completely astonished how much higher quality and contrast perception I had when wearing glasses
The same with an Zeus sf and swarovision
Anybody any explanation?
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Old Tuesday 8th August 2017, 11:49   #2
Vespobuteo
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Quote:
Originally Posted by arran View Post
I started wearing glasses with a moderate astigmatism correction in both eyes of - 75
I have always been using my bins without glasses with no issues at all
After using my noctivid for a while I started comparing the image-quality with and without glasses
I was completely astonished how much higher quality and contrast perception I had when wearing glasses
The same with an Zeus sf and swarovision
Anybody any explanation?
Your eyes get better with glasses.
I suspect astigmatism is more important and more rewarding to correct
than some other problems you can have with your eyes.
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Old Tuesday 8th August 2017, 12:23   #3
PeterPS
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I agree that your eye's astigmatism is the main culprit.
Above all, I agree with your spelling of Zeiss: Zeus!
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Old Tuesday 8th August 2017, 17:22   #4
Troubador
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Quote:
Originally Posted by arran View Post
I started wearing glasses with a moderate astigmatism correction in both eyes of - 75
I have always been using my bins without glasses with no issues at all
After using my noctivid for a while I started comparing the image-quality with and without glasses
I was completely astonished how much higher quality and contrast perception I had when wearing glasses
The same with an Zeus sf and swarovision
Anybody any explanation?
Arran, I think you must be teasing us. If your spectacles improve your vision when you are not using binos it stands to reason they will improve vision when looking through binos because although you can adjust for difference between the eyes, binos cannot correct astigmatism.

Lee
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Old Thursday 10th August 2017, 00:27   #5
Alexis Powell
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...Anybody any explanation?
Uh, your glasses correct your astigmatism, right? That's one of the reasons I wear glasses w/bins.

--AP
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Old Thursday 10th August 2017, 14:56   #6
Binastro
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I can tolerate 0.25 dioptre of astigmatism quite well with binoculars, although one needs to use high power on a planetary telescope to eliminate this properly.
I used to rotate my head to gain the best resolution even with high power.
With 0.5 dioptre it isn't really tolerable using binoculars although I still don't use glasses, especially if it is only in one eye.
I would think that with 0.75 dioptre of astigmatism, which I consider a lot, one needs to wear glasses with binoculars.

Star images with unaided eyes even with 0.25 dioptre of astigmatism for me clearly show messy out of focus rings.

'Theoretically', even 0.25 dioptre of astigmatism means one should wear glasses, but the observer needs to see if this is necessary or not.
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