The sclera is the white portion of the eye, and can either be preserved whole or cut into thirds. Once preserved the sclera can be used up to one year.

Human sclera grafts are widely used in ophthalmic surgery. They are mainly used for coating orbital implants after enucleation, covering scleral damage as in rheumatoid arthritis or in reconstruction after complicated filtering bleb surgery in glaucoma & in combination with buckling surgery. Other examples include the covering of filtration system such as an Ahmed valve or in complicated lid reconstruction. Coating orbital implants with human sclera allografts reduces the risk of rejection by the recipient.
Methods: for the preparation of sclera grafts, all other tissues must be removed from the donor bulb including the retina, choroid, cornea, vitreous and lens. The sclera graft can be stored in ethanol until transplantation.

The common way is storing in Ethyl Alcohol for at least 1 year at room temperature. Thus, the demand for sclera grafts can be covered without a lot of trouble.