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Central and peripheral choroidal thickness and eye length changes during accommodation.

Dinesh Kaphle1,2, Katrina L Schmid1, Marwan Suheimat1

  • 1Centre for Vision and Eye Research, Queensland University of Technology, Brisbane, Queensland, Australia.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 4, 2023
PubMed
Summary
This summary is machine-generated.

During accommodation, eye length increases while the choroid thins. This study investigated peripheral choroidal thinning and its relation to eye length changes during accommodation.

Keywords:
accommodationaxial lengthchoroidal thicknessmyopiaperipheral eye length

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Area of Science:

  • Ophthalmology
  • Physiological Optics
  • Retinal Imaging

Background:

  • Accommodation, the eye's ability to focus on near objects, involves complex changes in ocular structures.
  • Previous research indicates increased eye length during accommodation, but the behavior of the peripheral choroid remains less understood.

Purpose of the Study:

  • To investigate whether the peripheral choroid thins during accommodation.
  • To determine the relationship between peripheral choroidal thickness changes and concurrent eye length alterations.

Main Methods:

  • Utilized spectral-domain Optical Coherence Tomography (OCT) to measure choroidal thickness and eye length.
  • Measurements were taken in 53 young adults (emmetropes and myopes) at central and peripheral retinal locations (±30°).
  • Pupil dilation was achieved using phenylephrine, and participants fixated targets at 0D and 6D accommodation stimuli.

Main Results:

  • Eye length significantly increased with accommodation, with the greatest change observed centrally.
  • Choroidal thickness decreased with accommodation, with changes approximately two-thirds of the eye length increase.
  • Peripheral choroidal thinning was observed, accounting for about 60% of the eye length increase across the horizontal visual field.

Conclusions:

  • Accommodation induces both eye length increase and choroidal thinning in central and peripheral retinal regions.
  • The findings highlight a significant interplay between axial elongation and choroidal changes during the accommodative process.