> I have a pair of soft contact lenses (about 75% water content) which
> are rapidly silting up with calcium deposits. This didn't happen
> with my previous pair (38% water). What I'd like to know is, are the
> deposits made of the same stuff as scale in a kettle, and if so is
> it feasible to remove them by soaking the lenses in a weak acid?

>Subject: Re: Calcium deposits on soft C/Ls
>Date: Mon, 10 Jan 1994 10:59:15 GMT

>> I have a pair of soft contact lenses (about 75% water content) which
>> are rapidly silting up with calcium deposits. This didn't happen
>> with my previous pair (38% water). What I'd like to know is, are the
>> deposits made of the same stuff as scale in a kettle, and if so is
>> it feasible to remove them by soaking the lenses in a weak acid?
>This is me, following myself up. I carried out the test over the
>weekend, soaking the lenses in fresh lemon juice filtered through a
>coffee filter for about 24 hours at room temp. Result: No perceptible
>reduction in calcium deposits, and the lenses appear to have taken on
>a slight yellow tinge which is resistant to my 3% H2O2 solution.
>However, they do feel a bit more comfortable now and the yellow is not
>noticeable (to me, anyway!)
>Next I'll try spirit vinegar at an elevated temperature.
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