More About Low Vision
About Low Vision
An ever-increasing number of people are at risk of visual impairment as populations grow and demographic shifts move towards the predominance of older age groups. Potentially blinding eye conditions such as age-related macular degeneration (AMD), diabetic retinopathy and glaucoma are increasing as the number of people affected grows. These are non-communicable chronic eye diseases to which the principles of long-term care including issues of cost of treatment and compliance (adherence) apply. Additionally, more programs for those with low vision will need to be made available. Globally, in 2002 more than 161 million people were visually impaired, of whom 124 million people had low vision and 37 million were blind.
Classifying low vision
Wikipedia used as a reference:
Anyone with reduced vision not corrected by spectacles or contact lenses can be considered to be visually impaired. The World Health Organization uses the following classifications of visual impairment. When the vision in the better eye with best possible glasses correction is:
20/30 to 20/60: is considered mild vision loss or near normal vision.
20/70 to 20/160: is considered moderate visual impairment, or moderate low vision
Legal blindness 20/200 to 20/400: is considered severe visual impairment, or severe low vision
20/500 to 20/1,000: is considered profound visual impairment, or profound low vision.
More Than 20/1,000: is considered near-total visual impairment, or near total blindness.
No Light Perception: is considered total visual impairment, or total blindness
There are also levels of visual impairment based on visual field loss (loss of peripheral vision).
In the United States, any person with vision that cannot be corrected to better than 20/200 in the best eye, or who has 20 degrees (diameter) or less of visual field remaining, is considered to be “legally blind” or eligible for disability classification and possible inclusion in certain government sponsored programs.Magnitude of visual impairment
Globally, in 2002 more than 161 million people were visually impaired, of whom 124 million people had low vision and 37 million were blind. However, refractive error as a cause of visual impairment was not included, which implies that the actual global magnitude of visual impairment is greater.