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Facility of accommodation in myopia.

D J O'Leary1, P M Allen

  • 1Department of Optometry and Ophthalmic Dispensing, Anglia Polytechnic University, Cambridge, UK. D.O'leary@anglia.ac.uk

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|September 21, 2001
PubMed
Summary

Myopic students exhibit reduced distance accommodation facility compared to emmetropic students. This study highlights differences in visual accommodation responses between these groups.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Myopia is often associated with altered accommodative system function.
  • Understanding accommodation facility is crucial for myopia management.

Purpose of the Study:

  • To investigate and compare accommodation facility characteristics in myopic and emmetropic students.
  • To identify specific differences in distance and near accommodation responses.

Main Methods:

  • Accommodation facility was measured in 79 students (37 myopes, 42 emmetropes) aged 18-27.
  • Distance and near accommodation response times were assessed using specific lens pairs over a 1-minute period.
  • Masked procedures were employed for subject selection and data analysis.

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Main Results:

  • Mean distance accommodation facility was significantly lower in myopes (9.7 cpm) versus emmetropes (15.6 cpm; p < 0.005).
  • No significant differences were found in near accommodation facility between myopic and emmetropic groups.
  • Delayed positive accommodation response time for distance vision (>4s) occurred in 45% of myopes compared to 9% of emmetropes.

Conclusions:

  • Myopes demonstrate abnormal accommodation responses, particularly to blur.
  • Reduced distance accommodation facility is a common characteristic in myopia.
  • Near accommodation facility does not significantly differ between myopic and emmetropic individuals.