Definition of disability clarifies enumerated conditions and certification thresholds for persons with disability and severe disability. The document enumerates statutory categories of disability (including blindness, low vision, leprosy cured, hearing impairment, locomotor disability, mental retardation, mental illness, autism, cerebral palsy and multiple disabilities) and explains that a Person with disability is determined by medical certification of a prescribed degree of impairment, while Severe disability denotes a higher certified degree across one or more conditions.