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Old Sep 2nd 2013, 08:26 PM   #1
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Convexo-concave vs plano-concave vs concave-concave lens

Is there a reason to choose a convexo-concave lens over a plano-concave or a concave-concave lens if each have a net divergence?

(The context I am thinking about is the correction of myopia.)

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Any input would be GREATLY appreciated!
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Old Sep 3rd 2013, 10:32 AM   #2
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All lenses are an approximation to the ideal lens.
For spectacles I would suggest that the purely optical properties are of relatively modest priority.
The quality of the human eye is too low to make the diffference between a good lens and a perfect lens really noticable.
The main considerations will be comfort and cost.

Comfort largely comes from reducing the amount of glass needed.
Cost (I am guessing) might come from any special manufacturing arrangments required.
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