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Vision of humans and other organisms depends on several organs such as the lens of the eye, and any vision correcting devices, which use optics to focus the image. The eyes of many animals contains a lens that focuses the light of its surroundings onto the retina of the eye. This lens is essential to producing clear images within the eye.
Vision of Thomas Aquinas in the Vatican Museum. Evelyn Underhill distinguishes and categorizes three types of visions: [3]. Intellectual Visions – The Catholic dictionary defines these as supernatural knowledge in which the mind receives an extraordinary grasp of some revealed truth without the aid of sensible impressions, and mystics describe them as intuitions that leave a deep impression.
Visual perception is the ability to interpret the surrounding environment through photopic vision (daytime vision), color vision, scotopic vision (night vision), and mesopic vision (twilight vision), using light in the visible spectrum reflected by objects in the environment.
Peripheral vision of the human eye Field of view of the human eye. Peripheral vision, or indirect vision, is vision as it occurs outside the point of fixation, i.e. away from the center of gaze or, when viewed at large angles, in (or out of) the "corner of one's eye".
Tubular vision: Since macular fibers are the most resistant to glaucomatous damage, central vision remains unaffected until the end stages of glaucoma. It results in tubular vision, or tunnel vision , by the loss of peripheral vision with retention of central vision, resulting in a constricted circular tunnel-like field of vision.
Vision, a ship used by botanist Frederick Strange during the early days of Australian colonisation Vision-class cruise ship , six ships built by Royal Caribbean International Vision of the Seas , a cruise ship
If the analogy of the eye's retina working as a sensor is drawn upon, the corresponding concept in human (and much of animal vision) is the visual field. [2] It is defined as "the number of degrees of visual angle during stable fixation of the eyes". [3] Note that eye movements are excluded in the visual field's definition.
At the low end of the range is the absolute threshold of vision for a steady light across a wide field of view, about 10 −6 cd/m 2 (0.000001 candela per square meter). [ 22 ] [ 23 ] The upper end of the range is given in terms of normal visual performance as 10 8 cd/m 2 (100,000,000 or one hundred million candelas per square meter).