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Does transient increase in axial length during accommodation attenuate with age?

Deborah S Laughton1, Amy L Sheppard1, Edward A H Mallen2

  • 1Ophthalmic Research Group, Life and Health Sciences, Aston University, Birmingham, UK.

Clinical & Experimental Optometry
|March 16, 2017
PubMed
Summary

Transient axial length changes during accommodation increase with age but decrease significantly after 43-44 years. This age-related reduction in axial length changes suggests increased ocular rigidity, potentially influencing presbyopia development.

Keywords:
accommodationaxial lengthbiometrycrystalline lenspresbyopia

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Understanding age-related changes in ocular dimensions is crucial for presbyopia research.
  • Transient accommodative axial length changes are a key factor in visual function.

Purpose of the Study:

  • To profile transient accommodative axial length changes across adulthood.
  • To investigate differences in these changes between myopic and emmetropic individuals.

Main Methods:

  • Ocular biometry using LenStar and WAM 5500 Auto Ref/Keratometer.
  • Measurements taken during 0, 3.00, and 4.50 D accommodation stimuli.
  • Data corrected for crystalline lens thickness changes; participants aged 18-60 years (35 emmetropes, 37 myopes).

Main Results:

  • Axial length significantly increased with accommodation (p < 0.001).
  • No significant difference in axial length change magnitude based on refractive error (p = 0.959).
  • A significant reduction in the magnitude and variance of axial length change was observed after age 43-44 (p < 0.002).

Conclusions:

  • Transient axial length increase with accommodation shows a negative association with age.
  • Reduced variance in axial length changes after age 43-44 suggests increased posterior ocular rigidity.
  • Increased ocular rigidity may play a role in the development of presbyopia.