Hi Everyone.
I am curious as to when you should not use an aspheric lens (other than possible adaptation problems from a patient's old lens)?
Is there a disadvantage to using aspheric lenses mild Rx patients? I know that there will not be much advantage to having a flatter front base curve, but I don't know that it would hurt either. Also, having a somewhat larger "sweet spot" around the optical center would be a good thing.
Also, why do we not see more aspheric lenses in CR-39 bi-focals. I know that many times a patient could get by just fine on a moderate Rx with apsheric lenses instead of high index and there wouldn't be very much difference in the finished lens.
Just trying to activate a few brain cells:bbg:
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