Corneal topography and pachymetry are used to screen for abnormal corneas. The hospital also has a cornea bank in which imported corneas are stored. Not all patients with diseased corneas are candidates for endothelial keratoplasty. The swimmer's heart, liver, kidneys and corneas were transplanted. His corneas were used for transplants. This was mainly due to opacities in both corneas, complicated by hyperopia and astigmatism. His organs except his corneas were donated. Eye banks check the donor corneas for any disease or cellular irregularities. Two years after having the corneas implanted, six of the 10 patients had improved vision. Laser surgery has been done to create multifocal corneas. About 70 of those dogs had severe oral disease, disintegrating jaws, and scarred corneas. Patients may also have hearing loss and clouded corneas. Ghost crabs have elongated and swollen eyestalks with very large corneas on the bottom half. It can cause blindness by rapid destruction of the corneas. The success rates are similar for both procedures in patients with clear corneas.