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Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
Recovery from blindness is the phenomenon of a blind person gaining the ability to see, usually as a result of medical treatment. As a thought experiment , the phenomenon is usually referred to as Molyneux's problem .
Hemeralopia or day blindness is the inability to see clearly in bright light and is the exact opposite of nyctalopia (night blindness), the inability to see clearly in low light. [1] It is also called heliophobia. [2] It can be described as insufficient adaptation to bright light.
Different shaped stress balls, including a cube, a star, and a sphere. Molyneux's problem is a thought experiment in philosophy [1] concerning immediate recovery from blindness.
The Blind Milton (Thomas Uwins, c. 1817) "When I Consider How My Light is Spent" (also known as "On His Blindness") is one of the best known of the sonnets of John Milton (1608–1674). The last three lines are particularly well known; they conclude with "They also serve who only stand and wait", which is much quoted though rarely in context.
It was designed as a TTY for deaf-blind people and is also useful for face-to-face conversation. It has two components: The sighted component is a modified SuperCom TTY device. It has a qwerty keyboard and a single-line LED display. The display is regular size and is not particularly suited to people with low vision.
It is the cause of approximately 5% of blindness in the United States and nearly 60% of blindness in parts of Africa and South America. [12] Blindness from cataracts occurs in about 10 to 40 per 100,000 children in the developing world, and 1 to 4 per 100,000 children in the developed world. [7] Cataracts become more common with age. [1]
It has since been integrated into VISION 2020 and is coordinated by the International Agency for the Prevention of Blindness (IAPB) in cooperation with the World Health Organization. The theme for World Sight Day 2014 [1] —held on October 9, 2014—was "No more Avoidable Blindness". It took place on the second Thursday in October 2014. [2]