I have metal wire-rimmed glasses that have an oblong shape, and my
right lens tends to pop out of the rims. I can easily pop it back in, but in a
day or two, it will pop out. Does anyone have any suggestions as to how I can
fix the problem.
Actually, I would bet that there is a little screw to tighten the metal rim,
and if so, you should tighten it carefully with the requisite jeweler's
screwdriver. Better yet, the place that sold you the glasses will fix this
for free. Glue of any sort is probably not a good idea, and probably won't
work anyway. This includes epoxy. And it is all but impossible to do a
glue job without getting stuff on the lens.
My friend is an optometrist and said they have a special shim tape to correct
that promblem. He also said it happens only with metal frames and plastic
lenses. If you had glass lenses it wouldn't happen. It has something to do with
the lenses shrinking in the cold weather.
It does happen with glass lenses, it has happened to me and I cannot use
plastic lenses. It has nothing to do with cold weather, the metal
shrinks as much as the lens. It has everything to do with a BAD job by
the glass maker, the only real cure is a larger lens. The optician
would rather give you a cheap shim instead of fixing it right and
grinding a new lens.
free men own guns - slaves don't
To Nick Hull:
Maybe you should look at this web page.
It shows the Coefficient of
Thermal Expansion for various material.
You will see that plastic such as Plexiglass expanse 3 to 6 time that of
common metals. So this would act in the opposite in contraction. You may
notice a material named Delrin, I have used this material because it can
take a high temperature. The only problem is that it expanse like crazy
and what you thought was a loss fit at room temperature is a very tight
fit when heated up.
The problem of the plastic lense falling out because it cold is a real
thing. It has happen to me and I have observed how loose the lense was
when I placed it back into the frame and it was cold.
Then looked at them when it was all warmed up and now it was a tight fit.
I hope I have been able to enrich your life a little.
I had this demonstrated this morning. I went from a warm 72 F inside
and went for a walk outside at -12F. Within the first 20 minutes one of
the lenses in my wire frame glasses fell out. These lenses have always
been quite tight in their metal hoops. Looking at the linear
coefficients of expansion, CR-39 (typical plastic ophthalmic lens
material) is 81x10**-6, and Aluminum is 12.8x10**-6. Quite a
difference. I had already decided on glass lenses for future eyeglasses
because of scratch resistance, and this further emphasized the
benefits of glass lenses.
Polycarbonate is preferable to CR-39 since it has a much higher impact
resistance and a higher refractive index. AIUI, most optical lenses
today are actually polycarbonate.
Polycarbonate has an expansion coefficient of only 3.9 x10^-6.
I doubt many frames are made of aluminum. Most are of alloys of
steel, titanium and such. They have coefficients of thermal expansion
around half that of aluminum -- 6.5 x10^-6 for steel, 4.9-7.0 x10^-6
for various titanium alloys. You can lool up various brass and other
So, comparing the material actually used in glasses, the thermal expansion
coefficients aren't so different.
If your lenses fall out because of a temperature change - they were made
incorrectly. In over forty years of wearing glasses, I've never had a
problem with temperature change.
I have seen them use shim tape, super glue and silicone glue (Elmer's stix
all). I vote for the shim tape because you can kiss the frame goodbye the
next time you replace the lenses (from experience). I would also take them
back and ask them to fix it properly (so that I could use the frame again).
BUt first check if the screw that holds the lense in is tight. If need be,
they will applie some liquid locking compound to the screw to keep it from
As others have said shim tape is the way too go. It looks similar to scotch
If your handy, remove the frame screw, allowing the lens to fall out, cut a
thin strip of scotch tape and place it on the edge of your lens, replace
lens and screw. You may only need to tape across the top to make it fit
I had a pair of wire rim glasses with oblong lenses and had the same
problem as you are having. I only wear glasses for driving, so I put
up with it for quite a while. I had the store where I purchased the
glasses try to fix the problem a couple of times and tightened the
screws more times than I care to think about. Finally the threads on
the lense tightening screw got worn out (it was only the lense on one
side that ever fell out) and I just simply got a new prescription and
new glasses with rounder lenses and no problems now.
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