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The resulting perception is also known as eyesight, sight or vision. The various physiological components involved in vision are referred to collectively as the visual system , and are the focus of much research in psychology , cognitive science , neuroscience and molecular biology .
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]
Visual perception is the ability to detect light and use it to form an image of the surrounding environment. [1] Photodetection without image formation is classified as light sensing. In most vertebrates, visual perception can be enabled by photopic vision (daytime vision) or scotopic vision (night vision), with most vertebrates having both.
Year Event 1843 Vision test types are invented in 1843 by the German ophthalmologist Heinrich Kuechler (1811–1873), in Darmstadt, Germany.He argues for need to standardize vision tests and produces three reading charts to avoid memorization.
The visual acuity is assigned in the form of a fraction. Visual acuity is recorded as "20/20" (or another fraction like 20/40) when all optotypes (letters or symbols) on a specific line of the eye chart are correctly identified. When an individual correctly identifies additional 2 letters in the next 20/30 lines, then they will be assigned 20/40+2.
LASIK or Lasik (/ ˈ l eɪ s ɪ k /; "laser-assisted in situ keratomileusis"), commonly referred to as laser eye surgery or laser vision correction, is a type of refractive surgery for the correction of myopia, hyperopia, and astigmatism. [1]
"The Sight", a short story by Brian Moore; The Sight, a 1985 film based on the short story by Brian Moore; Sight, a 2008 film; Sight, a film starring Greg Kinnear; The Sight (Hunter novel), 2007 novel in the Warriors: Power of Three series by Erin Hunter; The Sight (Clement-Davies novel), a 2002 book about wolves by David Clement-Davies
Additionally, long and full eyelashes are coveted as a sign of beauty and are considered an attractive facial feature. [110] Pupil size has also been shown to play an influential role in attraction and nonverbal communication, with dilated (larger) pupils perceived to be more attractive. [ 111 ]