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Related Experiment Videos

Relations between accommodation and vergence in darkness.

K S Wolf1, H E Bedell, S B Pedersen

  • 1New England College of Optometry, Boston, Massachusetts.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|February 1, 1990
PubMed
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Accommodation and vergence systems remain linked, or coupled, even in darkness. This study shows that while resting postures appear independent, vergence can be predicted from accommodation and phoria, suggesting persistent synkinesis.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Science

Background:

  • Previous research indicated that accommodation and vergence are uncoupled in darkness.
  • This raised questions about the persistence of accommodation-vergence synkinesis without visual stimulation.

Purpose of the Study:

  • To investigate if accommodation-vergence synkinesis persists when both visual systems are deprived of stimulation.
  • To examine the relationship between resting postures of accommodation and vergence in darkness.

Main Methods:

  • Tracking accommodation and vergence postures in 20 normal subjects for 15 minutes in darkness.
  • Utilizing a Vernier optometer and dichoptic nonius lines for precise measurements.
  • Analyzing correlations between resting postures and spontaneous fluctuations.

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Main Results:

  • Mean resting postures of accommodation and vergence showed weak correlation (r = 0.19).
  • Spontaneous fluctuations in darkness also exhibited low correlation (median r = 0.15).
  • Resting vergence postures were predictable from distance phoria and resting accommodation, considering AC/A ratios (r = 0.65).

Conclusions:

  • The relaxation of accommodation and vergence to separate resting postures in darkness is compatible with persistent synkinesis.
  • Independent neural noise in each system may reduce the apparent coupling under open-loop conditions (darkness).