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Related Experiment Videos

Tonic accommodation: a review. I. Basic aspects

M Rosenfield1, K J Ciuffreda, G K Hung

  • 1Department of Vision Sciences, State University of New York/State College of Optometry, NY 10010.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|July 1, 1993
PubMed
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Tonic accommodation (TA), the eye's response without visual stimulus, is likely an aggregate of non-optical stimuli. This suggests the term "tonic accommodation" may inaccurately describe this complex, stimulus-free accommodative response.

Area of Science:

  • Ophthalmology
  • Physiological Optics
  • Neuroscience

Background:

  • Accommodation is the eye's ability to adjust focus.
  • Tonic accommodation (TA) is the accommodative state in the absence of a visual stimulus, previously thought to reflect ciliary muscle innervation.
  • Understanding TA is crucial for visual function and optical correction.

Purpose of the Study:

  • To review and critically evaluate the concept of tonic accommodation (TA).
  • To discuss the relationship between TA, closed-loop accommodative function, and autonomic physiology.
  • To examine measurement techniques and terminology for stimulus-free accommodation.

Main Methods:

  • Literature review of studies on tonic accommodation.
  • Analysis of existing theories and measurement methods for accommodative function.

Related Experiment Videos

  • Discussion of physiological and clinical aspects of TA.

    • Main Results:

    • The accommodative response in stimulus-free conditions is not solely due to tonic innervation.
    • This response appears to be an aggregate of multiple, non-optical stimuli.
    • Current understanding and terminology for TA may be insufficient.

    Conclusions:

    • The term "tonic accommodation" may be inappropriate due to the heterogeneous nature of the stimulus-free response.
    • Further research is needed to accurately define and measure this complex accommodative behavior.
    • Part II of this review will explore accommodative adaptation and clinical implications of TA.