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Association between Refractive Errors and Ocular Biometry in an Elderly Population.

Hassan Hashemi, Aria Bouyeh1, Mehdi Khabazkhoob2

  • 1Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
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Summary

In older adults, refractive errors are linked to ocular biometrics. The axial length to corneal radius ratio strongly correlates with refractive error, and anterior chamber depth differs between myopes and hyperopes.

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Area of Science:

  • Ophthalmology
  • Ocular Biometry
  • Refractive Error Analysis

Background:

  • Refractive errors and ocular biometric components are crucial in understanding visual health.
  • Geriatric populations present unique challenges for refractive error assessment.

Purpose of the Study:

  • To investigate the relationship between refractive errors and ocular biometric parameters in individuals aged 60 and above.
  • To identify key biometric factors influencing refractive error in the elderly population.

Main Methods:

  • A population-based, cross-sectional study utilizing multistage random cluster sampling in Tehran, Iran.
  • Comprehensive eye examinations including visual acuity, autorefraction, subjective refraction, slit-lamp examination, and ocular biometry using Pentacam AXL.
  • Statistical analysis controlled for age, sex, and nuclear cataract to determine correlations.

Main Results:

  • The axial length/corneal radius of curvature ratio showed the strongest correlation with refractive errors (r = -0.63).
  • Axial length, anterior chamber depth, and anterior chamber volume were significantly different between myopic and hyperopic individuals (P < .001).
  • Axial length and nuclear cataract were inversely related to spherical equivalent, while corneal radius, anterior chamber depth, central corneal thickness, and corneal diameter were directly related.

Conclusions:

  • The axial length/corneal radius of curvature ratio is the most significant biometric predictor of refractive error in this geriatric cohort.
  • Anterior chamber depth is shallower in myopic eyes compared to hyperopic eyes, independent of axial length.