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18 relations: Accommodative insufficiency, Binocular vision, Cathode ray tube, Ciliary muscle, Computer vision syndrome, Diplopia, Eye, Eye examination, Headache, Hertz, Heterophoria, Liquid-crystal display, Photophobia, Pulse-width modulation, Refractive error, Symptom, Vision therapy, Visual looming syndrome.
Accommodative insufficiency
Accommodative insufficiency (AI) involves the inability of the eye to focus properly on an object.
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Binocular vision
In biology, binocular vision is a type of vision in which an animal having two eyes is able to perceive a single three-dimensional image of its surroundings.
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Cathode ray tube
The cathode ray tube (CRT) is a vacuum tube that contains one or more electron guns and a phosphorescent screen, and is used to display images.
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Ciliary muscle
The ciliary muscle is a ring of smooth muscleSchachar, Ronald A. (2012). "Anatomy and Physiology." (Chapter 4). in the eye's middle layer (vascular layer) that controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal. It changes the shape of the lens within the eye, not the size of the pupil which is carried out by the sphincter pupillae muscle and dilator pupillae.
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Computer vision syndrome
Computer vision syndrome (CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time and the eye muscles being unable to recover from the strain due to a lack of adequate sleep.
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Diplopia
Diplopia, commonly known as double vision, is the simultaneous perception of two images of a single object that may be displaced horizontally, vertically, diagonally (i.e., both vertically and horizontally), or rotationally in relation to each other.
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Eye
Eyes are organs of the visual system.
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Eye examination
An eye examination is a series of tests performed by an ophthalmologist (medical doctor), optometrist, or orthoptist assessing vision and ability to focus on and discern objects, as well as other tests and examinations pertaining to the eyes.
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Headache
Headache is the symptom of pain anywhere in the region of the head or neck.
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Hertz
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
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Heterophoria
Heterophoria is an eye condition in which the directions that the eyes are pointing at rest position, when not performing binocular fusion, are not the same as each other, or, "not straight".
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Liquid-crystal display
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals.
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Photophobia
Photophobia is a symptom of abnormal intolerance to visual perception of light.
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Pulse-width modulation
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal.
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Refractive error
Refractive error, also known as refraction error, is a problem with focusing light accurately onto the retina due to the shape of the eye.
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Symptom
A symptom (from Greek σύμπτωμα, "accident, misfortune, that which befalls", from συμπίπτω, "I befall", from συν- "together, with" and πίπτω, "I fall") is a departure from normal function or feeling which is noticed by a patient, reflecting the presence of an unusual state, or of a disease.
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Vision therapy
Vision therapy (also known as vision training, or VT) is used to improve vision skills such as eye movement control, eye coordination, contrast sensitivity, and perception.
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Visual looming syndrome
Visual looming syndrome is a problem with visual perception that causes people to inaccurately think that a stationary object is moving towards them, and might poke their eyes.
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Asthenopia, Eye fatigue, Eyestrain.
