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Alternating ocular accommodation, not constant, reduced intraocular pressure (IOP) in healthy adults. This effect persisted with aging, despite age-related eye changes.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Physiology

Background:

  • Intraocular pressure (IOP) regulation is crucial for ocular health.
  • Ocular accommodation, the eye's ability to change focus, involves ciliary muscle activity.
  • Age-related changes in ocular structures may influence IOP dynamics.

Purpose of the Study:

  • To investigate the impact of conscious changes in ocular accommodation on intraocular pressure (IOP).
  • To assess how ocular biometrics are affected by accommodation in different age groups.
  • To determine if aging influences the relationship between accommodation and IOP.

Main Methods:

  • 35 healthy volunteers (20, 40, 60 years old) underwent ocular biometric measurements (cornea, anterior chamber, pupil, ciliary muscle) using OCT and autorefraction.
  • Intraocular pressure (IOP) was measured via pneumotonometry.
  • Participants performed three tasks: nonaccommodation, constant accommodation, and alternating accommodation, with IOP measured after each.

Main Results:

  • Alternating accommodation significantly decreased IOP by 0.7 mmHg across all age groups (p=0.029).
  • Constant accommodation or nonaccommodation alone did not significantly alter IOP.
  • Older adults (60 y.o.) exhibited age-related changes in ciliary muscle thickness, anterior chamber dimensions, and pupil size compared to younger groups.

Conclusions:

  • Alternating accommodation is an effective method for reducing intraocular pressure (IOP).
  • The IOP-lowering effect of alternating accommodation is maintained in older individuals.
  • Future research could explore increased accommodative workload or duration to enhance IOP reduction.