CPF or PLS lenses

[Diane]

Is anybody using any of these lenses anymore? Have they been replaced primarily by other high contrast lenses and if so, what are they?


Diane

[JerryR]

I remember CPF lenses from Corning about 20 years ago. They were touted as helpful for macular degeneration patients, retinitis pigmentosa patients and a variety of other uses. I was wondering if they were still available.

[obxeyeguy]

I have used them years ago, and very few. I believe that they are produced by Winchester optical in Elmira NY. Sorry I do not have a phone # for them.
Mark

[Robert Martellaro]

http://www.visionadvantage.net/corni...caloptics2.htm

[Dougfir8]

They are still used for patients with severe vision/light sensitivity problems. They are glass, expensive, and available from Winchester in Elmira, NY. 1-800-742-5273. They process the lenses.

[Uncle Fester]

I used the PLS series from Younger with success many years ago. I'd say they discontinued them at least 5 years ago supposedly from a lack of sales. I had a macular degeneration patient who I thought was having a heart attack when he first put on the 550 red lenses he was so excited! Nothing like making the blind see for job satisfaction:)

BPI now makes a 550 dye that should work but be aware the lenses are a deep reddish color to be effective and the dye is more expensive than their standard colors.

[HarryChiling]

BPI also makes monochrome 600 I think thats the color that wprks really well, same issue deep deep red.

Check out this link:

http://www.achromat.org/uc.pdf

Page 57 goes into lesn options for Achromats that covers some of these very same lenses and tints that would interest you.

[Dougfir8]

The Corning CPF lenses are photochromatic, a version of the PGX technology.

[chip anderson]

I seem to remember CPF as being Dow-Corning Glass and monochromatic in Light yellow orange, red orange and mostly red with and orangeish tint.
The numbers 550 and 650 possibly something other ?50.

Chip

[Clive Noble]

Of course CPF are still available.... very much so.... we import them from France into Israel.

Yes, they're expensive, they are Corning Photochromic Filters and they work... you should see the face of an Albino kiddie who hasn't been able to open her eyes outdoors even with dark sunspecs. As soon as she got her 550XD (Extra Dark) it was a new world

The plastic dyes look the same colour, and we have tried to use them in our LVA clinic, but they are no substitute for the real thing

[Diane]

Thanks Guys,

I used to use the CPF lenses a lot and then did the same thing as some of you have done with the tints, but with not the same result for those patients like RP patients.

I familiar with Winchester, and thought that was the only source in USA.

Clive, do you get a number of RP patients?

Diane

[jherman]

After going though the web link the thought of Dr Gallas's lens came to mind.

Wonder if a Photochromic Melanin lens would be as effective, or effective at all for some of the same conditions?

[Diane]

After going though the web link the thought of Dr Gallas's lens came to mind.

Wonder if a Photochromic Melanin lens would be as effective, or effective at all for some of the same conditions?

I have his white paper on that subject, and was thinking along the same lines. I'll have to do further research on the subject. As a person ages, they begin to lose the anti-oxidants that protect us against a multitude of maladies. The same holds true of our eyes, which makes us more sensitive to the damage of the HEV (high energy visible) wavelengths, one of the primary causes of AMD.

Diane

[Dougfir8]

There are quite a few choices, and some of the Corning lenses will change in different lighting situations. See the CPF series.

http://www.winoptical.com/medical/plens.htm