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Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
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Semiautomatic procedure to assess changes in the eye accommodative system.

Aikaterini I Moulakaki1, Daniel Monsálvez-Romín1, Alberto Domínguez-Vicent1

  • 1Optometry Research Group (GIO), Optics, Optometry and Vision Sciences Department, University of Valencia, C/Dr. Moliner, 50, 46100, Burjassot, Spain.

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Summary

A new semiautomatic procedure effectively measures in vivo changes in the crystalline lens and ciliary muscle during accommodation. This tool reveals significant alterations in anterior lens radius and ciliary muscle area, with minimal changes in central lens thickness.

Keywords:
AccommodationAgeingCiliary muscleCrystalline lensOptical coherence tomographyPresbyopia

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Area of Science:

  • Ophthalmology and Vision Science
  • Biomedical Engineering

Background:

  • Accommodation is crucial for clear vision, involving dynamic changes in the crystalline lens and ciliary muscle.
  • Accurate in vivo measurement of these changes is essential for understanding visual function and developing interventions.

Purpose of the Study:

  • To evaluate a novel semiautomatic procedure for assessing in vivo changes in the crystalline lens and ciliary muscle during accommodation.
  • To compare these changes between young and adult subjects.

Main Methods:

  • Anterior segment optical coherence tomography was used on 14 subjects (young: 20-25 years, adult: 35-40 years).
  • A semiautomatic procedure measured central lens thickness (CLT), anterior lens radius (ALR), and ciliary muscle area (CMA) at unaccommodated and 3.00 D accommodated states.

Main Results:

  • Central lens thickness (CLT) increased by less than 5% in both groups.
  • Anterior lens radius (ALR) decreased by approximately 30% in both groups, with higher variability in younger subjects.
  • Ciliary muscle area (CMA) increased by less than 30% in both groups, with similar dispersion.
  • No statistically significant differences were found between the young and adult groups for any metric.

Conclusions:

  • The semiautomatic procedure is a valuable tool for in vivo analysis of the accommodative system.
  • Accommodation-induced changes in CLT are considerably smaller than those observed in ALR and CMA.