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Scleral changes with accommodation.

Alejandra Consejo1, Hema Radhakrishnan2, D Robert Iskander1

  • 1Department of Biomedical Engineering, Wroclaw University of Science and Technology, Wroclaw, Poland.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|April 26, 2017
PubMed
Summary
This summary is machine-generated.

The sclera changes shape during accommodation, particularly in young myopes. These significant scleral shape changes are linked to accommodative effort and refractive error.

Keywords:
accommodationanterior eye surfacemyopiascleratopography

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Area of Science:

  • Ophthalmology
  • Biomechanics of the eye
  • Visual optics

Background:

  • The sclera, the eye's protective outer layer, is traditionally considered rigid.
  • Understanding scleral dynamics during accommodation is crucial for comprehending ocular biomechanics and visual function.

Purpose of the Study:

  • To investigate whether scleral shape changes occur during accommodation.
  • To quantify these potential scleral shape alterations.
  • To determine if age and refractive error influence these changes.

Main Methods:

  • Employed a high-resolution corneo-scleral topographer (Eye Surface Profiler) to measure scleral shape.
  • Recruited 22 participants aged 19-84, categorized into emmetropes and myopes.
  • Applied varying accommodative stimuli (0.0 D, 2.5 D, 4.0 D) and calculated elevation differences on a 16 mm chord.

Main Results:

  • Significant scleral shape changes were observed during accommodation in young individuals capable of accommodation.
  • These changes were more pronounced in myopic subjects compared to emmetropes, especially at higher accommodative demands (4.0 D).
  • Scleral deformation varied between meridians and was not significant in subjects with limited accommodation.

Conclusions:

  • Scleral shape is dynamic and alters with accommodation.
  • The accommodative-induced scleral changes are more significant in myopes than emmetropes.
  • Age and refractive status are key factors influencing scleral response to accommodation.