Board index » vision » Remove hard water stain from Eye glasses

2008-02-15 12:00:49 PM
The other week I noticed my eye glasses had dried hard water stains on
them. This seems to have accumulated over time. My lenses are glass
lenses (not plastic). I thought that the lens cleaning solution you
get at the optical stores would do the job - that did not help. Also
tried vinegar, but no success. Is there any to get rid of these dried
stains. If not, the option is new lenses. Appreciate any advice.
Thanks.
-

It's probably not a deposit, but a coating that's peeling off.
I'm not sure coatings can be removed from glass.
-MT
"Alpha83" <tapsen7@gmail.com>wrote

On or about Thu, 14 Feb 2008 20:00:49 -0800 (PST) did Alpha83
<tapsen7@gmail.com>dribble thusly:
absolutely take them off. If you've done that, and they haven't gone
away, then what you may be looking at is etching. Basically, very
fine scratches that accumulate over time, and give a fogged
appearance.
--
- Mike
Ignore the Python in me to send e-mail.
-

med vision
Human vision, visual correction, and visual science

In article
<c1069731-ee36-4143-a871-264f9be3d830@e23g2000prf.googlegroups.com>,
Alpha83 <tapsen7@gmail.com>wrote:
idea of what the source of your problem can be. The usual hard water
arises from dissolved calcium bicarbonate that turns into insoluble
calcium carbonate upon heating heating or exposure to the atmosphere.
That material, however should be easily removed with a weak acid like
vinegar. "Permanent" hard water will usually arise from totally soluble
minerals such as magnesium sulfate. They will interact with ordinary
soap to make a poorly soluble soap. Could that be problem? That is, have
you tried to clean your glasses with soap?
Beyond that, there may be some rarer kinds of hard water such as
dissolved iron. Upon exposure to air, a valence change may occur that
oxidizes the iron into an insoluble form (rust). That is not likely.
You should be able to get a list of impurities in the water from your
water supplier.
Bill
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In article
<c1069731-ee36-4143-a871-264f9be3d830@e23g2000prf.googlegroups.com>,
Alpha83 <tapsen7@gmail.com>wrote:
idea of what the source of your problem can be. The usual hard water
arises from dissolved calcium bicarbonate that turns into insoluble
calcium carbonate upon heating heating or exposure to the atmosphere.
That material, however should be easily removed with a weak acid like
vinegar. "Permanent" hard water will usually arise from totally soluble
minerals such as magnesium sulfate. They will interact with ordinary
soap to make a poorly soluble soap. Could that be problem? That is, have
you tried to clean your glasses with soap?
Beyond that, there may be some rarer kinds of hard water such as
dissolved iron. Upon exposure to air, a valence change may occur that
oxidizes the iron into an insoluble form (rust). That is not likely.
You should be able to get a list of impurities in the water from your
water supplier.
Bill
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On Feb 14, 8:05 pm, "Mike Tyner" <mty...@mindspring.com>wrote:
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