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Depth Perception and Intraocular Differences in Visual Acuities Among Older Spectacle Wearers.

Ivana Mravicic1, Selma Lukacevic1, Ante Barisic1

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Summary

Stereoacuity declines with age and is affected by differences in corrected vision between eyes. Assessing stereoacuity and aniseikonia helps prevent falls in older adults.

Keywords:
Stereoacuityaniseikoniapresbyopiaquality of lifevisual acuity

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Area of Science:

  • Ophthalmology
  • Gerontology
  • Vision Science

Background:

  • Falls are a significant societal burden, with incidence increasing with age.
  • Corrective refractive error procedures are considered for fall prevention.
  • Reduced depth perception, linked to stereoacuity, contributes to falls in the elderly.

Purpose of the Study:

  • To investigate the relationship between age, interocular visual acuity differences, and refractive errors with stereoacuity and aniseikonia.
  • To assess the impact of ocular parameters like axial length, pupil size, and higher-order aberrations (HOAs) on visual function.
  • To understand these factors in asymptomatic presbyopic spectacle wearers.

Main Methods:

  • 91 subjects underwent comprehensive eye assessments, including refractive error, stereoacuity, aniseikonia, HOAs, axial length, and pupil size measurements.
  • Stereoacuity was measured at distance (6m) and near (40cm) using Randot Stereotests.
  • Aniseikonia was assessed using the Awaya test, and resultant aniseikonia (AR) was calculated.

Main Results:

  • Age and interocular differences in corrected distance visual acuity significantly correlated with distance stereoacuity.
  • Interocular differences in corrected distance and near visual acuities were associated with near stereoacuity.
  • No significant correlation was found between stereoacuity and interocular differences in pupil size or HOAs.

Conclusions:

  • Stereoacuity is age-dependent and influenced by interocular visual acuity differences in spectacle wearers.
  • Interocular differences in pupil size and HOAs do not significantly impact stereoacuity in this population.
  • Evaluating stereoacuity and aniseikonia is crucial for fall prevention strategies in older adults.