On Jul 3, 5:50*am, Noke <gad.g...@yahoo.com> wrote:
> On Jul 3, 2:39*am, "Mike Tyner" <mty...@mindspring.com> wrote:
>
>
>
>
>
> > "Noke" <gad.g...@yahoo.com> wrote
>
> > >In other words. Even the furrows with polished edge will not do good
> > >and one has to replace the entire lens everytime there is any trace
> > >of scratches in the gas permeable hard contacts?? Thanks.
>
> > Not in my opinion, for what that's worth.
>
> > -MT
>
> > *in messagenews:bdfff537-fddc-4769-b817-(E-Mail Removed)...
> > On Jul 2, 9:08 pm, "Mike Tyner" <mty...@mindspring.com> wrote:
>
> > > It's like the furrow a plow leaves. The material you remove from the
> > > furrow
> > > forms ridges on either side.
>
> > > The discomfort of "scratched" lenses comes from the ridges, not the
> > > furrow.
> > > Anything that scratches will open the epithelium so germs can penetrate.
> > > Ulcers usually start from broken epithelium and it doesn't really matter
> > > what caused the break. And one good way to get ulcers is to scratch the
> > > epithelium then keep it covered with a nasty contact lens. Normally ulcers
> > > are prevented by the cleaning action of blinking and the antibacterial
> > > lysosyme in tears.
>
> > > Polishing removes the ridges, along with calcified deposits and other
> > > "protruding" imperfections. To remove the furrow, you'd have to resurface
> > > the lens completely, reducing its thickness uniformly to match the deepest
> > > scratch. That's very difficult to do with a polishing pad; you'd want a
> > > surfacing tool and you'll still break some lenses.
>
> > > The furrows aren't uncomfortable, especially after they fill up with mucus
> > > and debris and bio-junk. That also creates a warm gooey bed for
> > > cultivating
> > > bacteria and fungi.
>
> > > Scratches that are "too deep to remove" will still feel better after
> > > polishing. They can also be full of polishing compound and ground-up lens
> > > material for a while.
>
> > > -MT
>
> About the furrows that can cultivate bacteria and fungi. Can't
> cleaning
> the lens each night remove the contents in the furrows? What would
> it take to remove it? I ordered a pair of gas permeable hard contact
> from a manufacturer. The right side doesn't have scratch, but
> unfortunately, the left side has a scratch in the middle. They
> polished
> it and there is still a trace of the scratch and they won't replace
> it.
> I can wait a week and order elsewhere but my present contact even
> has more scratches (about 20). So I am wondering whether to get
> it now or wait one more week for a new lens from another manufacturer.
> The decision depends on knowing whether a single furrow is harmful.
> Usually what would it take to remove the contents in the furrows like
> polishing compound and ground-up lens material? What ingreidents
> are polishing compound made of? Is it harmful to eyes? How
> about the ground-up lens material. Can it cause scratches in
> the eye? Thanks.
>
> Noke
>
>
>
>
>
> > > "Noke" <gad.g...@yahoo.com> wrote in message
>
> > >news:7592be83-840f-4bc1-89ce-(E-Mail Removed)....
>
> > > > Hi,
>
> > > > When gas permeable hard contacts get scratches. What
> > > > actually happens to the lens? Can anyone point me to any
> > > > site with magnified view of a lens surface? I'd like to understand
> > > > what goes on when polishing is done to "remove" the
> > > > scratches. The technician said some scratches are deep
> > > > and can't be removed. Can these cause corneal ulcers?
> > > > How doe scratched lens surfaces damage the cornea?
> > > > I'd like to kinda imagine what goes on between the cornea
> > > > and lens with scratches and how does the frictions or
> > > > contact occurs. Thanks.
>
> > > > Noke- Hide quoted text -
>
> > > - Show quoted text -
>
> > In other words. Even the furrows with polished edge will not do good
> > and one has to replace the entire lens everytime there is any trace
> > of scratches in the gas permeable hard contacts?? Thanks.
>
> > Noke- Hide quoted text -
>
>
BTW... letterings such as UV, etc. are often edged on the GP
hard contacts lens itself. Were these lettering made of slumps?
Arethe slumps hollow or did they fill it up with another glass filler?
If hollow. Can they stuck up mucus, debris, bio-junk, bacteria,
fungi, polishing material and/or ground up lens? If so. How
come they put slump lettering when this can stuck up debris?
Thanks.
Noke
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