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Do progressing myopes show reduced accommodative responses?

Mark Rosenfield1, Roshni Desai, Joan K Portello

  • 1State University of New York, State College of Optometry, New York 10036, USA. Rosenfield@sunyopt.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 10, 2002
PubMed
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This study found that a larger lag of accommodation did not precede or accompany myopia development in young adults. Stable myopes showed the greatest accommodative lag, but this did not correlate with myopia progression.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Myopia, a common refractive error, affects visual acuity.
  • The role of accommodation, the eye's ability to focus, in myopia development is debated.
  • Understanding accommodative responsivity may offer insights into myopia prevention and management.

Purpose of the Study:

  • To investigate if an increased lag of accommodation precedes or accompanies myopia development.
  • To analyze the relationship between accommodative lag and refractive error stability over one year.
  • To determine if reduced accommodative response during nearwork is linked to myopia onset.

Main Methods:

  • Longitudinal study monitoring refractive error and accommodative responsivity over 12 months.
  • Accommodation measured at 4-month intervals for stimulus levels of 2.5, 3, 4, and 5 Diopters.

Related Experiment Videos

  • Calculated accommodative stimulus-response gradients and accommodative error for all participants.

    • Main Results:

    • Most subjects showed accommodative stimulus-response gradients near unity.
    • A lower gradient was observed in subjects with stable myopia at baseline.
    • Stable myopes exhibited the largest lag of accommodation compared to non-myopes.

    Conclusions:

    • The findings do not support the hypothesis that reduced accommodative response accompanies myopia development in young adults.
    • A larger lag of accommodation in stable myopes may reflect an adaptation rather than a cause of their refractive state.
    • Further research is needed to fully elucidate the complex mechanisms underlying myopia progression.