After the death of the donor, the cornea must be retrieved within a few hours and will be screened for diseases and assessed for its viability to be used for a corneal transplantation by assessing its health. If passed, the cornea will be stored in a nutrient solution at an eye bank until needed for an operation. In most cases, the<unk>  is removed from the donor cornea prior to storage as this extends its possible storage time. For the operation procedure, the patient is anaesthetised and the damaged or diseased<unk>  will be removed using a bladed instrument called a trephine (approximately 8.0–8.5mm in diameter). A<unk>  of matching size is then put in place of the removed tissue and stitched in place. Usually, twelve clock-hour nylon stitches are used with a continuous band nylon stitch. The procedure takes approximately 60–90 minutes however, a few months will be required for vision to return to what it was like preceding the operation; and continue to improve from then on. Approximately 12–18 months after the operation, all stitches will be removed. During this time, anti-rejection drops will be needed to minimise inflammation; the dosage of which is carefully monitored by a corneal surgeon. Due to the swelling, it is impossible to predict the quality of vision without removing the stitches. A few months after the stitches are removed, measurements are made of the shape of the cornea and refractive error. If the shape of the cornea is fairly regular and refractive error is similar to that of the other eye, it is usually possible to fix any error with glasses; if not, a hard lens may be necessary to correct vision.
Corneal button
Optic cup 
Corneal limbus
Scleral lens
Lacrimal groove
Optic pit
Stenopaeic slit
Intraocular lens