Ceguera -

: Often defined as vision of 20/200 or less in the better eye with best correction.

: Globally, at least 2.2 billion people have vision impairment, and roughly 43 million are completely blind. Ceguera

Medical organizations classify vision loss based on visual acuity and field of vision. : Visual acuity worse than 3/60 or 20/400. : Often defined as vision of 20/200 or

Individuals who are blind use various tools and systems to navigate a visual world. Different Methods for Writing in Braille Ceguera