The term, “blind person” means either a person who has not more than 20/200 central visual acuity in the better eye after correction, or a person who has visual acuity greater than 20/200 but with a limitation in the fields of vision such that the widest diameter of the visual field subtends an angle no greater than 20 degrees. Such blindness shall be certified by a licensed physician and surgeon who specializes in diseases of the eye or a licensed optometrist.