In case you have limitations to donate through the credit card. You may send your cheque / DD in favour of "Medical Research Foundation" to:

Mr. S. Alagiri
Department of Fundraising
Sankara Nethralaya,
18, College Road,
Chennai - 600 006.
e-mail id: alagiri@snmail.org, donation@snmail.org
Tel: 91-44-28202448
Mobile: 9383573811