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Medical Forum / General / Vision / September 2005

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Polarized contact lenses?

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stevek - 09 Sep 2005 20:32 GMT
After reading all about contact lenses recently, especially the recent
"nike sport tint" stuff, it occurred to me that it ought to be possible
to create a polarized filter on contact lenses.

Basically, you'd need a toric lens with the toric weighting, but +0.0
cylinder (unless, of course, it's needed for correction).  I suppose
there's some difficulty that would be involved in actually applying the
filtration:  you'd either need to apply some kind of coating, or
somehow figure out how to align things when the lenses are cast..

It seems that polarized lenses are good for cutting down on glare, and
might be comfortable enough for all-around use..

Anyone think this would be a good idea?
Mike Tyner - 09 Sep 2005 23:16 GMT
> filtration:  you'd either need to apply some kind of coating, or
> somehow figure out how to align things when the lenses are cast..

Good idea but blasted tough to implement.

Polarized spectacle lenses use a film of acetate or similar material
sandwiched between two clear layers of plastic.

The film includes an emulsion of crystals formed in an electric field, so
they all orient (mostly) in one direction.

I'm pretty sure the only materials you can use for such emulsions would be
pretty hostile in a soft contact lens.

Then you have the problem of dark contacts that have to be removed at night,
plus problems with LCD screens, watchfaces, and speedometers that disappear
with polarized filters.

All-in-all, it seems better to wear contacts for vision and let Foster Grant
do the polarizing.

-MT
 
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