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Related Experiment Videos

Accommodative state of young adults using reading spectacles.

Jennifer A Shapiro1, Jennifer E Kelly, Howard C Howland

  • 1Department of Neurobiology and Behavior, W-201 Mudd Hall, Cornell University, Ithaca, NY 14853, USA.

Vision Research
|December 8, 2004
PubMed
Summary

Young adults wearing reading spectacles consistently over-accommodated, focusing closer than the target. Prolonged wear did not alter their accommodative state, highlighting the need for accurate measurement of visual posture.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Reading spectacles are commonly used to correct presbyopia.
  • Understanding accommodative behavior with reading spectacles is crucial for visual comfort and performance.
  • Previous research has explored accommodative responses, but adaptation to reading spectacles requires further investigation.

Purpose of the Study:

  • To examine the accommodative state of young adults using +2D and +3D reading spectacles.
  • To investigate the effect of eliminating accommodative cues on accommodation.
  • To determine if adaptation occurs after a period of near work with reading spectacles.

Main Methods:

  • Refractive measurements were taken using an infrared PowerRefractor.
  • Subjects viewed far and near targets in free space and through a Badal lens apparatus.

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  • Refractive measurements were also recorded post-adaptation after wearing +2D spectacles for 30 minutes.

    • Main Results:

    • Subjects uniformly over-accommodated when wearing reading spectacles, focusing in front of the target.
    • No significant difference in accommodation was found after 30 minutes of near work with +2D spectacles compared to pre-adaptation.
    • Binocular viewing with +2D spectacles showed no significant accommodative difference before and after reading.

    Conclusions:

    • No adaptation of accommodative posture occurred after a 30-minute near work task with reading spectacles.
    • The consistent over-accommodation indicates a potential issue with visual tasks performed with reading spectacles.
    • Accurate measurement of accommodative posture is essential when subjects use reading spectacles.