Corneal transplantation is the use of allogeneic normal clear tissue to replace cloudy and diseased corneal tissue to restore sight or control corneal disease in the affected eye. It has the highest success rate among allogeneic transplants and is one of the most important sight restoration procedures in ophthalmology. Corneal transplantation is the use of allogeneic normal clear tissue to replace cloudy corneal tissue to restore vision or control corneal disease in the affected eye. It has the highest success rate among allogeneic transplants and is one of the most important sight restoration procedures in ophthalmology. A corneal transplant is a procedure in which the diseased corneal tissue is removed and replaced with a clear, functioning cornea. Depending on the location of the corneal lesion, if it is in the center, then only the central portion is replaced; if it is located at the edge of the cornea, then replacing the cornea with a marginal lesion is sufficient. The indications are: corneal diseases that change the cornea from clear to cloudy and affect vision, such as corneal leukoplakia, corneal opacity, cone cornea, glaucoma or herpetic keratopathy caused by IOL surgery, corneal dystrophy, certain types of corneal ulcers, etc. The donor corneas used for corneal transplantation come from donations from others. Healthy individuals between the ages of 6 and 60 are generally suitable corneal donors.