accommodation reflex
Học thuậtThân thiện
Definition
Noun: * Reflex changes in the eyes that enable an object to be focused on the retina: The automatic adjustment of the eye's lens shape, pupil size, and convergence of the eyes to maintain clear focus on a near object.
Usage
The term is used in medical, physiological, and optometric contexts to describe the automatic, coordinated response of the eye when shifting focus from a distant to a near object. * The doctor tested the patient's accommodation reflex to assess the function of their cranial nerves. * A normal accommodation reflex involves three actions: the lens becomes rounder, the pupils constrict, and the eyes converge.
Advanced Usage
- "Near reflex": This is a synonym often used interchangeably with "accommodation reflex," emphasizing its trigger (a near object).
- "Accommodation-convergence reflex": A more specific term highlighting the linked actions of lens adjustment (accommodation) and inward turning of the eyes (convergence).
Variants and Related Words
- Accommodate (verb): In this context, it means to adjust the eye's lens to focus.
- The eye must accommodate to see the text clearly.
- Accommodative (adjective): Relating to accommodation.
- The patient has poor accommodative ability.
Synonyms
- Near reflex
- Accommodation-convergence reflex
Related Phrases and Concepts
- Pupillary light reflex: The automatic constriction of the pupil in response to bright light. This is a different reflex but is often compared or contrasted with the accommodation reflex in neurological exams.
- Presbyopia: The age-related loss of the eye's ability to accommodate, resulting in difficulty focusing on near objects.
Noun
- reflex changes in the eyes that enable an object to be focused on the retina