I share your dismay and empathize the difficulties you are facing.
Visual impairment disability in India is categorized based on its severity. Percentages are accorded as proposed by a subcommittee constituted by the Ministry of Social Justice and Empowerment in 1999. The categories of visual disability are notified in the Gazette of India, extraordinary, 2001 and are followed all over the country. On using the classification over the years, we have come across instances of visual disability that do not fit into any of the categories. Thus, disability certification board members have to rely upon their own discretion in categorizing some cases. You may read more here in this link-
Generally, the impairment of 40 percent or more is considered a handicap. As percentage of impairment in the case of a one-eyed person is only 30 percent, according to the approved definition in medical parlance, a person with one good eye is not a blind person.
You would be doing good for those handicapped with such disabilities if you take it up with the Ministry of Social Justice & Empowerment, Govt.of India in the manner indicated in this link-
Acts & Guidelines - Guidelines for other Disabilities: Office of the Chief Commissioner for Persons with Disabilities, Government of India
Nevertheless, May be, I suggest, you should think of opportunities like IT sector, where such disabilities are accepted. All the best friend.
9th January 2019 From India, Bangalore