Can Keratoconus Lead to Legal Blindness?Īt ReVision Optometry, many of our patients have keratoconus, a condition affecting one in several hundred and usually requires special custom contact lenses to restore vision. These conditions can impair vision even while wearing the best glasses or contact lenses. What are common causes of legal blindness? Cataracts, macular degeneration, retinal detachment, glaucoma, and diabetic retinopathy top the list. As you can imagine, a 20-degree field of view is tunnel vision.
The distance between the tip of your pinky and thumb will approximate a 20-degree field of view. How big is a 20-degree field of view? Hold your hand at arm’s distance away, with your fingers spread as far apart. An individual that can see the 20/20 letters is legally blind if the peripheral vision is limited to no more than a 20-degree field of view. involves measuring the width of your peripheral vision. Yes, you can be legally blind even if you can see the 20/20 letters! An alternative qualification for legal blindness in the U.S. You Can Still Be 20/20 and Legally Blind? If someone was legally blind before LASIK, they would necessarily still be legally blind after the procedure. Finally, it also makes no sense to say that before having LASIK that you were legally blind. That is why it is also nonsensical to say that you are legally blind without glasses or contact lenses. Furthermore, legal blindness is defined as vision with the best glasses or contact lenses. That is why it is nonsense to say that you are legally blind in one eye. Let me repeat, both eyes are open to meet the legal blindness criteria. In the U.S., legal blindness is defined as the inability to see 20/200 even with both eyes open and the best glasses or contact lenses. Legal Blindness Means with Both Eyes and the Best Vision Correction Many lay people talk about legal blindness without realizing it has a strict definition. It is a technical definition which allows a visually impaired person eligibility for specific disability benefits, tax deductions, reduced rates for public transportation, and special assistance from utility companies to name a few social services. Legal blindness refers to meeting specific criteria for reduced vision.
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