h a l f b a k e r yNot so much a thought experiment as a single neuron misfire.
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Modern soft contact lenses are extremely flexible - mine are 55% water. As a result, it's possible, while cleaning them, to flip them completely inside out, and it can be difficult to determine whether they've been re-flipped. They have a different profile when inside out, but you need to view the lens
edge-on against the light and it can be tricky to spot. After all, without my lenses in, I cannot see properly. When inside out, the lens still fits the eye and vision is still corrected, but neither function is as good as it should be.
I propose that the words "This side towards eye" be printed in large friendly letters on the inside surface of contact lenses.
Acuvue mark on side of lens.
http://www.jnjvisio...cts/inside_out.html
[jutta, Nov 30 2005]
[link]
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This is like my Fathers suggestion that contact lenses be made of fluorescent plastic to make them easier to find when you drop them..... |
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My lenses (and, I assume, most others) have a 5% blue tint, called a 'handling tint', to make them visible when immersed in water. |
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You could use one-way signage (I'll see
if I
can find a link) to make the writing only
visible from one side. I wouldn't want
my
eyeballs reading "eye sdrawot edis sihT"
all
day. [+] |
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[later] Can't find anything good on the
internet. Basically it's a neutral colour
grid of dots overprinted with an image
so that from one side you see image
and from the other just a grid of dots.
Make the dots small enough and you
don't notice them. |
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like the adverts on the buses? |
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You're lucky that flipped lenses still function for you. I also can see through my lenses when the wrong way out, but I get terrible dizzy-type nausea after about 2 hours. What is most annoying is that even when I flip the offending lens right way out, the nausea persists :-( |
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Some kind of marking that is obviously right-way-out/wrong-way-out would work. My lenses already have small markings on the lower edge to show which way up they go in my eyes. |
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i thought this was a contact lens compass |
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[Katisha]: I have the same dizzy-nausea problem, hence my requirement. My lenses have no "This side up" marking as my astigmatism is minimal, but my suggested text would serve this purpose also.
Actually, any symbol which is asymmetric (such as & or @) would suffice. |
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Acuvue has an "inside-out mark" that spells out "1-2-3" or "AV" when seen from the side in a correctly turned lens. (See link.) |
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If there was a small dot cast inside the lens near the edge that appeared as a small white dot from the wrong side, and a small black dot from the right, then, once the lenses were in you could look in the mirror. If you could see the white dot, then you would know that you had the lenses on inside-out! |
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[jutta]: Damn! Obviously a good idea then (although intended to be tongue-in-cheek). |
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//although intended to be tongue-in-cheek// |
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Interestingly enough my contact lens do have letter markings on them already. I buy them from acuvue! |
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