It has been proven beyond doubt that almost everyone can donate eyes. People who wear spectacles, with high B.P., diabetics or people with systemic disorders like asthma, tuberculosis, or even those who have undergone cataract surgery can donate eyes. The only criterion is a healthy and clear cornea.
Eyes have to be harvested within six hours of death. So it is critical to inform the nearest eye bank. It is always best to fill out an eye-pledge form and inform family members of your desire. Expressing a desire for eye donation in one's will is fairly useless since a will is generally opened only a few days after the death, while an eye needs to be harvested within six hours.