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Flexure occurs when an RGP becomes distorted while it is on the cornea, but assumes its normal shape when it is no longer on the cornea. Therefore, you will measure irregular astigmatism with keratometry or topography when the RGP is on the eye, but when the RGP is off of the eye you will not measure the irregular astigmatism. Flexure is usually caused when the RGP is thin and so its shape is easily contorted.