I've heard that RGP contact lenses can correct astigmatism because of the rigid form they have. And because of this it's not necesary to add the number of astigmatism diopters to these contact lenses.
But I've also heard that the number of diopters is also limited, and since certain strength is necesary to add the astigmatism diopters to these contact lenses too. Am I right?
How many diopters of astigmatism is the maximum they can correct by themselves, without adding them strength for this defect?
PD: Sorry for my English. It's not my first language.
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