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This is a case study on the application of a piggy-back lens in the correction of severe keratoconus. From the results of general eye examination, refractive state examination, and corneal morphology examination on the patient, it was determined that corneal protrusion and deformation of the right eye were obvious. The right eye was corrected using a piggy-back lens and the left eye with a rigid gas-permeable contact lens (RGPCL) alone. The right-eye lens fit well and the lens coverage was good. Both the static and dynamic fit results for
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