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Related Experiment Videos

Plus acceptance in hard contact lens wearers.

J R Paugh1, R Matoba, E N Matoba

  • 1Southern California College of Optometry, Fullerton.

American Journal of Optometry and Physiological Optics
|September 1, 1987
PubMed
Summary

Hyperopes wearing contact lenses accept more plus power than with spectacles. This phenomenon may be linked to neurosensory feedback between corneal sensation and accommodative tonus.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Neuroscience

Background:

  • Hyperopic patients often demonstrate increased plus power acceptance with contact lenses compared to spectacle correction.
  • This effect exceeds what is explained by vertex distance alone, suggesting other physiological factors are involved.

Purpose of the Study:

  • To investigate the underlying factors contributing to the phenomenon of greater plus power acceptance in hyperopes using contact lenses.
  • To explore the relationship between corneal sensation and accommodative tonus in this context.

Main Methods:

  • Eight hyperopic individuals, one myopic individual, and one control hyperope (ages 20-30) were fitted with polymethyl methacrylate contact lenses.
  • Over-refractions were conducted on separate days, both with and without corneal anesthesia, to assess refractive changes.

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Main Results:

  • All tested hyperopes accepted significantly more plus power when their corneas were not anesthetized (average of 0.725 D increase, p=0.0000).
  • This indicates a measurable difference in refractive response based on corneal sensory input.

Conclusions:

  • A potential mechanism involves neurosensory feedback, where reduced corneal sensation (due to anesthesia) influences the accommodative tonus of the ciliary body.
  • This feedback loop may explain the observed increase in plus power acceptance in hyperopic contact lens wearers.