Near reflex
Near reflex is a physiological response that involves the simultaneous enhancement of pupil constriction, accommodation, and convergence when the eyes shift focus from a distant to a near object.
Pronunciation
Near reflex is pronounced as /nɪər ˈriːflɛks/.
Etymology
The term "near reflex" is derived from the English words "near", meaning close, and "reflex", which refers to an automatic response to a particular stimulus.
Components of Near Reflex
The near reflex consists of three main components:
- Pupil constriction - This is the narrowing of the pupils, which allows for a greater depth of focus and reduces the amount of light entering the eye.
- Accommodation - This is the process by which the eye changes optical power to maintain a clear image or focus on an object as its distance varies.
- Convergence - This is the simultaneous inward movement of both eyes toward each other, usually in an effort to maintain single binocular vision when viewing an object.
Related Terms
- Pupil dilation - The opposite of pupil constriction, this is the widening of the pupils, which allows more light to enter the eye.
- Divergence - The opposite of convergence, this is the simultaneous outward movement of both eyes away from each other, usually in an effort to maintain single binocular vision when viewing an object at a distance.
- Presbyopia - A condition associated with aging, in which the eye exhibits a progressively diminished ability to focus on near objects.
External links
- Medical encyclopedia article on Near reflex
- Wikipedia's article - Near reflex
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