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Crystalline Lens Shape During Accommodation in Children.

Asik Pradhan1, Rohan P J Hughes1, Emily C Woodman-Pieterse1

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

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
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Summary

Myopic children exhibit flatter lens surfaces compared to non-myopic children. However, both groups demonstrate similar lens shape adjustments during accommodation, indicating consistent visual responses across refractive errors in young individuals.

Keywords:
AccommodationAstigmatismIOLMaster 700Lens shapeMyopia

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Area of Science:

  • Ophthalmology
  • Pediatric Optometry
  • Vision Science

Background:

  • Understanding how the eye's lens changes shape during accommodation is crucial for comprehending visual development and refractive error progression in children.
  • Previous research has primarily focused on adult lens dynamics, leaving a gap in knowledge regarding accommodative behavior in pediatric populations, particularly comparing myopic and non-myopic children.

Purpose of the Study:

  • To investigate and compare the effects of accommodation on lens shape in both myopic and non-myopic children aged 5-12 years.
  • To quantify changes in anterior and posterior lens surfaces during varying accommodation demands.

Main Methods:

  • Utilized the IOLMaster 700 to capture B-scan images of the lens at different accommodation levels (0-9 D) in 76 non-myopic and 18 myopic children.
  • Employed image processing and ray tracing techniques to analyze lens surface shapes, expressing them as refractive power vectors (M, J0, J45).

Main Results:

  • Across all participants, lens power increased with accommodation, leading to a more equiconvex lens shape.
  • Myopic children presented with significantly flatter anterior and posterior lens surfaces and lower total lens power compared to non-myopic children.
  • No significant differences were found in how lens shape changed with accommodation between the myopic and non-myopic groups.

Conclusions:

  • Myopic children possess inherently flatter lens surfaces than their non-myopic peers.
  • The accommodative response, in terms of lens shape modification, is comparable between myopic and non-myopic children, suggesting similar mechanisms for focusing.