Legal blindness is defined in 2 ways. First, if the vision in the better eye is 20/200 or less with corrective lenses (glasses or contacts), the person is considered legally blind. Second, someone whose peripheral vision is reduced to 20 degrees or less in the better eye is considered to be legally blind. (A person with normal peripheral vision has 140 degrees or greater of peripheral vision.) Reference: www.aoa.org and www.ct.gov.