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Related Concept Videos

Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Introduction to Special Senses01:26

Introduction to Special Senses

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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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Accessory Structures of the Eye01:17

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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
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Evaluating Whether Sight Is the Most Valued Sense.

Jamie Enoch1, Leanne McDonald1, Lee Jones1

  • 1Department of Optometry & Visual Sciences, School of Health Sciences, City, University of London, London, England.

JAMA Ophthalmology
|October 4, 2019
PubMed
Summary
This summary is machine-generated.

Sight is the most valued sense among UK adults, with hearing ranked second. Participants indicated a preference for 4.6 years of perfect health over a decade of blindness, highlighting the importance of vision.

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Area of Science:

  • Sensory perception research
  • Public health attitudes
  • Ophthalmology and audiology

Background:

  • Public perception often ranks sight as the most valued sense, yet empirical data is limited.
  • Practitioners, researchers, and funding bodies frequently assert the primacy of sight.
  • This study aimed to provide empirical evidence for these assertions.

Purpose of the Study:

  • To determine the public's most valued senses.
  • To quantify public attitudes towards sight and hearing loss.
  • To compare the value placed on sight versus hearing.

Main Methods:

  • A cross-sectional web-based survey of 250 UK adults was conducted.
  • Participants ranked eight senses (sight, hearing, touch, smell, taste, balance, temperature, pain) by value.
  • A time tradeoff exercise assessed the fear of losing sight or hearing.

Main Results:

  • Sight was ranked as the most valuable sense by 88% of participants.
  • Hearing was ranked second, followed by balance, significantly above other traditional senses.
  • Participants would trade 4.6 years of perfect health to avoid 10 years of blindness, versus 6.8 years to avoid 10 years of deafness.

Conclusions:

  • Sight is the most valued sense among the UK general public, followed by hearing.
  • The findings support the assertion that sight is highly valued.
  • Individuals are willing to forgo significant periods of perfect health to retain their sight.