NationMaster - Encyclopedia: Accommodative convergence

Accommodative convergence is that portion of the range of inward rotation of both eyes (i.e. convergence) that occurs in response to an increase in optical power for focusing by the crystalline lens (i.e. accommodation).^[1] Closeup of a blue-green human eye. ... In ophthalmology, convergence is the simultaneous inward movement of both eyes toward each other, usually in an effort to maintain single binocular vision when viewing an object ^ . It is a type of vergence eye movement. ... Optical power or dioptric power or refractive power is the degree to which a lens or mirror converges or diverges light. ... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ... Accommodation is the process by which the eye increases optical power to maintain a clear image (focus) on the retina. ...

Categories: Eye | Eye stubs Convergence insufficiency is a sensory and neuromuscular anomaly of the binocular vision system, characterized by an inability to converge the eyes or sustain convergence. ... In ophthalmology, divergence is the simultaneous outward movement of both eyes away each other, usually in an effort to maintain single binocular vision when viewing an object. ... Negative relative accommodation (NRA) is a measure of the maximum ability to relax accommodation while maintaining clear, single binocular vision [1]. See also Amplitude of accommodation Convergence insufficiency Eye examination Positive relative accommodation Category: ... Positive relative accommodation (PRA) is a measure of the maximum ability to stimulate accommodation while maintaining clear, single binocular vision [1]. See also Amplitude of accommodation Eye examination Convergence insufficiency Negative relative accommodation Category: ... A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision ^ . The two eyes converge to point to the same object When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the...

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