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do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: space-time
Date: December 28, 2008 07:52PM
just out of curiosity.

I wear glasses since I was about 25 (I am 37 now). There is a little bit of spherical power, but most of the power is cylindrical, yes, I have astigmatism.

If I don't wear glasses, and especially in lower light environment, when the iris opens up, I see double or even triple images, all lined up vertically. The number and separation between these images depends on the eye, how tired I am, how dark it is, etc.

so instead of the letter F, I might see an E, of even worse, an "E" with 4 or 5 horizontal lines. anyway, I digress. The main point is that this effect is very strong for BLUE signs, like those you see at the Mall for example. it's a lot less for RED or GREEN signs. Even with glasses, I have 20/20 vision or better, at least that's what different ophthalmologists told me, yet I have a harder time reading blue sings due to the above mentioned phenomenon.

Yesterday we were in Times Square and wife (also wearing glasses, but only Sperical, no Cylindrical component) mentioned she cannot read one of those Blue scrolling signs, but she could read fine the Red and the Green ones.

Now I am just curious if more people are having similar problems, if they have a harder time focusing on a blue sign rather than a green or red one.
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: AlphaDog
Date: December 28, 2008 08:03PM
I, too, have pretty significant astigmatism in both eyes, along with hyperopia, which is farsightedness caused by an imperfection in the eye, rather than by aging (I've got some of that, too.) I've noticed no difference in my ability to read signs because of their color. With glasses, I can read them; without glasses, I can't. It's pretty straightforward! smiling smiley
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: Doc
Date: December 28, 2008 08:09PM
No difference in sharpness based on background-colors ordinarily.

Blues may look faded after you've been out on a very clear day with a very blue sky or been staring at something else that was blue.

If it's chronic then there may be something wrong with your health. Maybe a vitamin deficiency. Maybe some sort of metal-poisoning. Maybe something genetic.

Tell your doctor about it.
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: MikeF
Date: December 28, 2008 08:33PM
Been wearing glasses full-time for about 17 years (near-sighted, although my arms are almost too short for reading :-) ). No color differentiation with or without them on.
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: space-time
Date: December 28, 2008 08:41PM
OK, sounds like this is not very common
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: mikebw
Date: December 28, 2008 09:13PM
Eyes are less sensitive to blue than red, in general.
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: dmann
Date: December 28, 2008 10:55PM
I'm 39 and have been wearing glasses and/or contacts since I was 17. Slight astigmatism in one eye and I can't see worth a darn without some sort of lens. No problem seeing blue with either contacts or glasses.

DM
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: davester
Date: December 29, 2008 01:01AM
There are signs out there?




"In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion." (1987) -- Carl Sagan
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: modelamac
Date: December 29, 2008 06:05AM
I'm 69, far-sighted, astigmatism, and have no problem with or without tri-focal glasses with blue signs.



Mr. Curmudgeon, on Mountain Lion.
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: -jeffB
Date: December 29, 2008 09:21AM
Blue light doesn't get focused as well as red/yellow/green light, even if your vision is perfectly corrected. This usually isn't a big deal, though, because most "blue" signs (at least the ones I see) are actually WHITE on blue, and the colors that provide the contrast -- red and green, which are present in the white stuff, but absent in the blue stuff -- are focused clearly.

Misguided designers who put a blue backlight on a display, or use blue light for general illumination, are Doing It Wrong. Black-on-blue or blue-on-black is much harder to read than almost any other black-and-color combination.

You mention "scrolling" blue signs, which makes me think that you're talking about blue letters on a black background. Yes, that's going to be hard to read. If you're having trouble with white letters on a blue background, there might be something else going on.
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: space-time
Date: December 29, 2008 09:56AM
yeah, I was referring to Blue Neon Signs or Blue LED signs on dark background.
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: iaJim
Date: December 29, 2008 11:01AM
Tell your doctor about the double vision. I had the same thing going on, and I just thought it was normal when one was tired. The doctor put a prism in my prescription and that has helped a lot.
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: mikebw
Date: December 29, 2008 04:15PM
Quote
-jeffB

Misguided designers who put a blue backlight on a display, or use blue light for general illumination, are Doing It Wrong. Black-on-blue or blue-on-black is much harder to read than almost any other black-and-color combination.

Exactly! I have seen many blue on black signs that are near impossible to see at a distance, especially at night. Red on black is much easier, as is white, or any other color besides blue!
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Re: do you wear glasses or contacts? do you have trouble seeing blue signs?
Posted by: jdc
Date: December 30, 2008 12:59AM
i cant see the blue like you are talking about, never thought to mention it to my eye doc -- just thought it was crappy design... heavy stig in my right eye -- to heavy to fix with contacts or lasers...



----

The Secret Diary of Steve Jobs [www.fakesteve.net]


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