Prevalence of low vision increases with age, according to 2010 U.S. EpidemiologyĬourtesy: National Eye Institute, National Institutes of Health (NEI/NIH) However, there is greater variation with visual field requirements, and some states do not require any visual field testing for licensure. Each state requires visual acuity measurements for licensure, and almost all set the minimum BCVA requirement to 20/40. Diagnosis of low vision is established by visual acuity examinations using the LogMAR chart, which is preferred over the Snellen chart due to improved accuracy. There are many causes of low vision, including macular degeneration, glaucoma, diabetic retinopathy, retinitis pigmentosa, eye trauma, and brain injury. In contrast, the World Health Organization defines low vision as BCVA of 20/60 to 20/200 or visual field <20 degrees in the better seeing eye. 1.3 Non-Commercial Driving Requirements per StateĪccording to the National Institutes of Health, low vision is defined as a best corrected visual acuity less than 20/40 (equivalent to 0.30 LogMAR) in the better-seeing eye.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |