The Arvind Eye Hospital at Madurai in collaboration with Rotary International runs an eye bank. You can check out their site for more information and since it is a not for profit organization, your donations are exempt from taxation as per section 80G.
If you cannot make a donation of any sort at least it is worth visiting their site and passing the information. Personally, I can vouch for the systematic treatment process at Arvind Eye Hospital, Madurai. A classic example for medical care that can still be provided at a Socialist (read: nominal) rate at an institution that can still practice some ethics. Arvind Eye Hospital does credible work (internationally acclaimed) and they have a renowned Post Graduate Institute of Ophthalmology.
Just in case if you would like to pass on the contact info of Eye Banks in Tamil Nadu, here it is:
Madurai
Arvind: +91 452 5356100
Tirunelveli
Arvind: +91 462 2337103
Coimbatore:
Arvind: +91 422 2578901
Coimbatore Eye Bank: +91 422 2397274
K.G.Eye Hospital Eye Bank: +91 422 2212121
Sankara Eye Society Eye Bank: +91 422 2666450
Chennai
Sankara Netralaya Eye Bank: +91 44 28271616
Lions Eye Bank Trust: +91 44 28553840
Agarwal Eye Institute and Research Center: +91 44 28273704
Trichy
Joseph Eye Hospital: +91 431 2462275
A.G. Eye Hospital: +91 431 2766101
Vellore
Schell Eye Hospital (CMC): +91 41 6232921