color vision and contact lenses HELP?? 
Author Message
 color vision and contact lenses HELP??


Quote:

>please share with me any info regarding contact lenses used to treat
>color vision defects I've heard of the x-chrom and the jls, does any
one
>have any on hands experience wearing these or fitting them? from who
are
>they available? how much? and what are the pros and cons to these
contact
>lenses.

>PS is there anything newer to treat color blindness??

>Thank you in advance

Tony:

I've fit x-chrom once and it worked but looked so wierd that the guy
finally stopped wearing it. Also, although it enabled him to pass the
color vision test, he complained of retinal rivalry which was sometimes
disconcerting.

Bill



Thu, 09 Oct 1997 03:00:00 GMT
 color vision and contact lenses HELP??
please share with me any info regarding contact lenses used to treat
color vision defects I've heard of the x-chrom and the jls, does any one
have any on hands experience wearing these or fitting them? from who are
they available? how much? and what are the pros and cons to these contact
lenses.

PS is there anything newer to treat color blindness??

Thank you in advance



Thu, 09 Oct 1997 03:00:00 GMT
 color vision and contact lenses HELP??

Quote:

> please share with me any info regarding contact lenses used to treat
> color vision defects I've heard of the x-chrom and the jls, does any one
> have any on hands experience wearing these or fitting them? from who are
> they available? how much? and what are the pros and cons to these contact
> lenses.

> PS is there anything newer to treat color blindness??

The X-Chrom lens is basically a dyed PMMA lens fitted to a non-{*filter*}
eye.  The aim is to enhance general hue discrimination, with the lens
having a maximal transmission above 575nm and other transmission below
480nm.

Results with the lens are generally emphasised as improvement on
pseudo-isochromatic colour tests.  Basically viewing through the X-Chrom
is the same as illuminating the colour vision test in a different colour
light.  Thereby changing the colour appearance and luminance contrast
which makes it easier for colour deficient persons to distinguish the
coloured plates.

Some detailed results are in a paper -

Paulson, H. (1980). The X-Chrom lens for the correction of colour vision.
  Militiary Medicine. 145,8,557-60.

In this study two severe cases of colour vision defects were tested with
a battery of colour vision tests. The protanomalous observer failed the
same colour vision tests with and without the X-Chrom lens.  While the
deutranopic observer improved on some tests whilst wearing the lens, but
not on others.

Some of the "side-effect" of wearing a monocular filter include -
reduced visual acuity, tilting of the image plane caused by the Pulfrich
effect and poor stereopscopic vision.

grant



Mon, 13 Oct 1997 03:00:00 GMT
 
 [ 3 post ] 

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