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Vision Screening
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D015351 |
[Application of tests and examinations to identify visual defects or vision disorders occurring in specific populations, as in school children, the elderly, etc. It is differentiated from VISION TESTS, which are given to evaluate/measure individual visual performance not related to a specific population.
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Vision Tests
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D014787 |
[A series of tests used to assess various functions of the eyes.
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Vision, Binocular
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D015348 |
[The blending of separate images seen by each eye into one composite image.
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Vision, Entoptic
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D014788 |
[Visual sensation derived from sensory stimulation by objects or shadows inside the eye itself, such as floating vitreous fibers, tissues, or blood.
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Vision, Low
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D015354 |
[Vision considered to be inferior to normal vision as represented by accepted standards of acuity, field of vision, or motility. Low vision generally refers to visual disorders that are caused by diseases that cannot be corrected by refraction (e.g., MACULAR DEGENERATION; RETINITIS PIGMENTOSA; DIABETIC RETINOPATHY, etc.).
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Vision, Monocular
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D015349 |
[Images seen by one eye.
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Vision, Ocular
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D014785 |
[The transducing of light energy to afferent nerve impulses in the retinal rods and cones. After light photons are absorbed by the visual photopigments, the signal is transmitted to the outer segment membrane by the cyclic GMP second messenger system, where it closes the sodium channels. This channel gating ultimately generates an action potential in the inner retina.
, The process in which light signals are transformed by the PHOTORECEPTOR CELLS into electrical signals which can then be transmitted to the brain.
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Visitors to Patients
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D014789 |
[Patients' guests and rules for visiting.
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Visna
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D016182 |
[Demyelinating leukoencephalomyelitis of sheep caused by the VISNA-MAEDI VIRUS. It is similar to but not the same as SCRAPIE.
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Visna-maedi virus
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D014790 |
[A species of LENTIVIRUS, subgenus ovine-caprine lentiviruses (LENTIVIRUSES, OVINE-CAPRINE), that can cause chronic pneumonia (maedi), mastitis, arthritis, and encephalomyelitis (visna) in sheep. Maedi is a progressive pneumonia of sheep which is similar to but not the same as jaagsiekte (PULMONARY ADENOMATOSIS, OVINE). Visna is a demyelinating leukoencephalomyelitis of sheep which is similar to but not the same as SCRAPIE.
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Visual Acuity
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D014792 |
[Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.
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Visual Analog Scale
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D064232 |
[A subjective psychometric response scale used to measure distinct behavioral or physiological phenomena based on linear numerical gradient or yes/no alternatives.
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Visual Cortex
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D014793 |
[Area of the OCCIPITAL LOBE concerned with the processing of visual information relayed via VISUAL PATHWAYS.
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Visual Field Tests
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D058609 |
[Method of measuring and mapping the scope of vision, from central to peripheral of each eye.
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Visual Fields
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D014794 |
[The total area or space visible in a person's peripheral vision with the eye looking straightforward.
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Visual Pathways
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D014795 |
[Set of cell bodies and nerve fibers conducting impulses from the eyes to the cerebral cortex. It includes the RETINA; OPTIC NERVE; optic tract; and geniculocalcarine tract.
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Visual Perception
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D014796 |
[The selecting and organizing of visual stimuli based on the individual's past experience.
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Visual Prosthesis
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D057488 |
[Artificial device such as an externally-worn camera attached to a stimulator on the RETINA, OPTIC NERVE, or VISUAL CORTEX, intended to restore or amplify vision.
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Visually Impaired Persons
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D019987 |
[Persons with loss of vision such that there is an impact on activities of daily living.
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Vitaceae
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D027844 |
[A plant family of the order Rhamnales, subclass Rosidae, class Magnoliopsida, best known for the VITIS genus, the source of grapes.
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