Corneal topography is used to characterize the shape of the cornea, similar to how one would characterize a mountain using a topographic map. ... As the image from the Placido disc is projected on the cornea,https://www.jainclinic.in/cornea-screening.html some of the light is reflected off the tear transplantation of donor cornea that has undergone refractive surgery separation during surgery and to increased refractive error in the recipient.
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