i need help for my father

I don't know what your father's age, income status, etc are but if you live in the USA you can try contacting your states department of health and human services and applying for medicaid. You can also try applying him for medicare.

Other organizations that may be able to help, in so far as at least maybe pointing you in the right direction

Lions Club
American Diabetes Association
Your states department of rehabilitation services
Your local hospital's social services department.

Mounir, I'm sorry about your father.  If you don't live in the US, try to contact your local health department or charities that are active in your city or country.  It's possible that the Lions Club has a chapter in your country.  The Lions Club is a charitable organization that helps those with vision problems.   Here is their website:   http://www.lionsclubs.org/EN/about-lions/index.php

Please do not post this more than one time.  Soliciting money is not allowed here.  Best of luck for your father.