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Related Experiment Videos

Presbyopia correction and the accommodation in reserve.

M Millodot1, S Millodot

  • 1Laboratory of Experimental Optometry, University of Wales College of Cardiff, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|April 1, 1989
PubMed
Summary

This study on presbyopia found that approximately 50.7% of accommodative amplitude is used, supporting the common practice of reserving half for comfort. Age and reading distance influence this percentage.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Presbyopia correction often involves reserving a portion of accommodative amplitude.
  • Empirical evidence for the optimal percentage of accommodation to reserve is lacking.
  • Commonly suggested reserves are one-third or one-half of the amplitude.

Purpose of the Study:

  • To determine the actual percentage of accommodative amplitude used in presbyopes.
  • To investigate the relationship between age, sex, reading distance, and accommodation usage.
  • To provide empirical data for presbyopia correction strategies.

Main Methods:

  • Recruited 305 presbyopic subjects aged 40-83.
  • Determined the 'add' power using a direct subjective clinical method.

Related Experiment Videos

  • Measured amplitude of accommodation and habitual reading distance.

    • Main Results:

    • Mean accommodative amplitude declined slightly until age 52, then stabilized.
    • Females exhibited slightly greater accommodation than males.
    • The mean percentage of accommodation used was 50.7%, confirming the 'half reserve' rule.
    • Accommodation usage varied significantly with age, sex, and reading distance.

    Conclusions:

    • The findings support reserving approximately half of the accommodative amplitude for presbyopia correction.
    • Age significantly correlates with the required 'add' power.
    • Accommodation reserve percentage decreases with age and shorter reading distances.