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accommodation

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accommodation reflex

accommodation reflex  

(convergence reflex) a reflex that occurs when an individual focuses on a near object, in which the crystalline lens becomes more convex, the pupils constrict, and the eyes turn inwards.
Adie's syndrome

Adie's syndrome  

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(Holmes-Adie syndrome) an abnormality of the pupils of the eyes, often affecting only one eye. The affected pupil is dilated and reacts slowly to light; the response on convergence accommodation of ...
anomalous myopia

anomalous myopia  

A transient form of myopia caused by the temporary absence of adequate stimuli for accommodation (1). See also dark focus.
Argyll Robertson pupil

Argyll Robertson pupil  

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A disorder of the eyes in which the pupillary (light) reflex is absent. Although the pupils contract normally for near vision (the accommodation reflex), they fail to contract in bright light. It may ...
assimilation

assimilation  

1 In physiology, the incorporation of new materials into the internal structure of an organism.2 In sociology, a process in which a minority group adopts the values and behaviour patterns of a ...
assimilation

assimilation  

1 Absorption or incorporation of information or of a substance, or more generally the act or process of making things similar or alike.2 In the writings of the Swiss psychologist Jean Piaget ...
assimilation

assimilation  

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Media studies
A psychological tendency to interpret new experience in a manner consistent with existing concepts or knowledge; compare accommodation. It includes the influence on perception of habits, interests, ...
ciliary body

ciliary body  

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The part of the eye that connects the choroid with the iris. It consists of three zones: the ciliary ring, which adjoins the choroid; the ciliary processes, a series of about 70 radial ridges behind ...
constructivism

constructivism  

Many cognitive psychologists now believe that humans learn most effectively where new information can be assimilated with previously held knowledge. This philosophy of learning is known as ...
convergence

convergence  

The medial rotation of the eyeballs so that each eye is directed to the object being viewed. Convergence acts with accommodation and pupillary constriction to help an athlete retain focus on an ...
crystalline lens

crystalline lens  

The biconvex, transparent, elastic structure immediately behind the iris of the vertebrate eye that helps to focus light rays on to the retina, although most (about two-thirds) of the refraction of ...
dark focus

dark focus  

A stable resting accommodation (1) of the eye's crystalline lens, usually corresponding to a focal distance of about one metre, that the eye assumes when confronted with a stimulus lacking any ...
depth perception

depth perception  

The visual perception of three-dimensional space through monocular cues and binocular cues that are present in the two-dimensional images projected on to the retinas of the eyes. It is served by the ...
emmetropia

emmetropia  

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n. the state of refraction of the normal eye, in which parallel light rays are brought to a focus on the retina with the accommodation relaxed. Distant objects are seen clearly without any effort to ...
equilibration

equilibration  

The restoration or maintenance of a state of equilibrium. Occlusal equilibration is achieved by selective grinding to modify the occlusal surfaces of the teeth and achieve occlusal harmony during ...
eye

eye  

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n. the organ of sight: a three-layered roughly spherical structure specialized for receiving and responding to light. The outer fibrous coat consists of the sclera and the transparent cornea; the ...
far point

far point  

The most distant point from the eye at which an object is focused on the retina without accommodation (1) of the crystalline lens, theoretically located at infinity for a normal eye but in practice ...
far vision

far vision  

Distance viewing, usually defined for objects more than 2 feet or about 60 centimetres from the eyes. See also accommodation (1), accommodation reflex, ciliary reflex, myopia, sympathetic nervous ...
focus

focus  

1. n. the point at which rays of light converge after passing through a lens. 2. n. the principal site of an infection or other disease. 3. n. (in radiography) the point of origin of an X-ray beam. ...
focusing

focusing  

(in animal physiology)The process of directing and concentrating light from a source onto the retina of the eye, by means of the lens, in order to obtain a clear image of objects at a range of ...

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