The projected number of blind persons in India would increase to 24.1 million in 2010 and 31.6 million 2020 (Sagar Borker-2011). As per National Programme for Control of Blindness (NPCB), the prevalence of blindness in India was 1.1% in 2001-02) and 1% in 2006-07. Age distribution of visual disability.
What is the prevalence of blindness and low vision?
Chennai is one of the four metropolitan cities in India and is popularly known as the “health city” of India. In such an urban population, we found the prevalence of blindness to be 0.85% (95% CI 0.6–1.1%), low vision 2.9% (95% CI 2.4–3.4%), and visual impairment (blindness + low vision) 3.8% (95% CI 3.2–4.4%) .
What is blindness epidemiology?
The projected number of blind persons in India would increase to 24.1 million in 2010 and 31.6 million 2020 (Sagar Borker-2011). As per National Programme for Control of Blindness (NPCB), the prevalence of blindness in India was 1.1% in 2001-02) and 1% in 2006-07. Age distribution of visual disability.
What is the prevalence of visual impairment?
Approximately 12 million people 40 years and over in the United States have vision impairment, including 1 million who are blind, 3 million who have vision impairment after correction, and 8 million who have vision impairment due to uncorrected refractive error.
What is the main cause of low vision?
Some of the most common causes of low vision include age-related macular degeneration, diabetes and glaucoma . Low vision may also result from cancer of the eye, albinism, brain injury or inherited disorders of the eye including retinitis pigmentosa.
What are the 7 causes of blindness?
- Uncorrected refractive errors. Uncorrected refractive errors, such as myopia, hyperopia or astigmatism, can all cause severe visual impairment. ...
- Cataracts. ...
- Age-related macular degeneration. ...
- Glaucoma. ...
- Diabetic retinopathy.
What do blind people see?
A person with total blindness won’t be able to see anything . But a person with low vision may be able to see not only light, but colors and shapes too. However, they may have trouble reading street signs, recognizing faces, or matching colors to each other. If you have low vision, your vision may be unclear or hazy.
What is the difference between blindness and low vision?
Low vision refers to a severe visual impairment in which visual acuity is 20/70 or poorer in the better-seeing eye and cannot improve with glasses or contacts. Legally blind means a person has a corrected vision of 20/200 in their best-seeing eye.
Who defines blindness 2020?
‘Blindness’ is defined as visual acuity of less than 3/60 , or a corresponding visual field loss to less than 10°, in the better eye with the best possible correction.
Can blindness be cured?
While there is no cure for blindness and macular degeneration, scientists have accelerated the process to find a cure by visualizing the inner workings of the eye and its diseases at the cellular level.
What is the most common cause of visual impairment?
Cataract . Cataract is a clouding of the eye’s lens and is the leading cause of blindness worldwide, and the leading cause of vision loss in the United States.
What are the three main categories of visual impairment?
- Mild –visual acuity worse than 6/12 to 6/18.
- Moderate –visual acuity worse than 6/18 to 6/60.
- Severe –visual acuity worse than 6/60 to 3/60.
- Blindness –visual acuity worse than 3/60.
What classifies as visually impaired?
Visual impairment is a term experts use to describe any kind of vision loss , whether it’s someone who cannot see at all or someone who has partial vision loss. Some people are completely blind, but many others have what’s called legal blindness.
Is Low Vision a disability?
There is no disability listing specifically for low vision , but the SSA does have a listing for vision loss or blindness. It covers loss of central visual acuity, loss of visual efficiency, and loss of peripheral vision. The listing, however, requires poor vision in both eyes.
What are the symptoms of low vision?
- Loss of central vision.
- Night blindness.
- Loss of peripheral vision.
- Blurred vision.
- Hazy vision.
What is a bad vision score?
20/30 to 20/60, this is considered mild vision loss, or near-normal vision. 20/70 to 20/160, this is considered moderate visual impairment, or moderate low vision. 20/200 or worse , this is considered severe visual impairment, or severe low vision.
