A 35-year-old Caucasian female presents to the clinic for continued follow-up of an ocular disease she was diagnosed with as an adolescent; her family history is positive. Her conical misshaped...

A 35-year-old Caucasian female presents to the clinic for continued follow-up of an ocular disease she was diagnosed with as an adolescent; her family history is positive. Her conical misshaped corneas have been progressively bulging and thinning over the last several years, and her rigid contact lenses are no longer providing sufficient relief. You recommend she undergo corneal transplants for which of the following diseases?

A. Keratopathy

B. Keratitis

C. Keratoconus

D. Arcus senilis