What is medical code 92312?

92311prescription of optical and physical characteristics of and fitting of contact lens, with medical supervision of adaptation; corneal lens for aphakia, 1 eye92312

prescription of optical and physical characteristics of and fitting of contact lens, with medical supervision of adaptation; corneal lens for aphakia, both eyes92313

prescription of optical and physical characteristics of and fitting of contact lens, with medical supervision of adaptation; corneoscleral lens