He is being seen by a pediatric ophthalmologist at Callahan eye foundation and thank you so much for the info..
You need to make sure your child is under the care of a university based (well known and reputable) ophthalmology group with a good Uveitis specialist and a good pediatric ophthalmologist. You can ask his ophthalmologist what his current vision is and compare to description by berrywoo which is correct. You can also be considered partially disabled if the vision in one eye is worse than 20/200. If the visual field in the better eye subtends an angle less than 20 degrees you can also be considered legally blind in some states (even if vision is 20/20).
HV
legal blindness in the U.S. is 20/200 best correct vision in the better seeing eye. This means that if you have 2 eyes with vision, one eye will have at best (with glasses and/or contacts if prescribed) 20/200 acuity, and the other eye will be worse than 20/200 (again wearing glasses and/or contacts), if the other eye has vision better than 20/200 the person is NOT legally blind. Legal blindness is also met with a visual field of 20 degrees or less.
Examples...if a person has the following best corrected visual acuities:
1. Right eye (O.D.): 20/200 Left eye (O.S.): 20/100 the person is NOT legally blind.
2. O.D.: 20/100 O.S.: LP (light perception) NOT legally blind
3. O.D.: 20/200 O.S.: CF (count fingers) Legally blind
4. O.D.: 20/200 O.S.: 20/400 Legally blind
Hope this helps