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Non-24-hour sleep–wake disorder causes a person's sleep–wake cycle to move around the clock every day, to a degree dependent on the length of the cycle. This is known as free-running sleep. [citation needed] People with the disorder may have an especially hard time adjusting to changes in "regular" sleep–wake cycles, such as vacations ...
Blind artists are people who are physically unable to see normally, yet work in the visual arts. This seeming contradiction is overcome when one understands that only around 10% of all people with blindness can see absolutely nothing at all. As such most blind people can in fact perceive some level of light and form, and it is by applying this ...
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]
Vision for perception and vision for action. Vision for perception and vision for action in neuroscience literature refers to two types of visual processing in the brain: visual processing to obtain information about the features of objects such as color, size, shape (vision for perception) versus processing needed to guide movements such as ...
Several blind photographers attempt to capture images that reflect their mental image of their subject, often called the "mind's eye" [1] or "soul's eye". [11] Their work is often inspired by their senses [9] [1] and past memories. [11] The intention is not to capture the object as it is but rather to focus on art, creativity, and a sense of ...
Stereoblindness (also stereo blindness) is the inability to see in 3D using stereopsis, or stereo vision, resulting in an inability to perceive stereoscopic depth by combining and comparing images from the two eyes . Individuals with only one functioning eye have this condition by definition since the visual input of the second eye does not ...
Cortical visual impairment. Cortical visual impairment (CVI) is a form of visual impairment that is caused by a brain problem rather than an eye problem. (The latter is sometimes termed "ocular visual impairment" when discussed in contrast to cortical visual impairment.) Some people have both CVI and a form of ocular visual impairment.
Action for Blind People. Action for Blind People was a national sight loss charity in the United Kingdom, that provided help and support to blind and partially sighted people of all ages. [1] In 2017 the organisation merged with the Royal National Institute of Blind People (RNIB) with which it had been in a partnership since 2009. [2]