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Association between Refractive Errors and Ocular Biometry in Iranian Adults.

Hassan Hashemi1, Mehdi Khabazkhoob1, Mohammad Hassan Emamian2

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

Journal of Ophthalmic & Vision Research
|January 6, 2016
PubMed
Summary

Axial length and corneal power significantly influence refractive error, especially in high myopia and hyperopia. Anterior segment measurements are more critical for hyperopia than myopia in adults aged 40-64.

Keywords:
AdultMiddle East RegionOcular BiometryRefractive Errors

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Area of Science:

  • Ophthalmology
  • Optometry
  • Biometrics

Background:

  • Refractive errors are a significant global health concern.
  • Understanding ocular biometric contributions to refractive error is crucial for developing effective interventions.

Purpose of the Study:

  • To investigate the association between ocular biometrics (axial length, anterior chamber depth, lens thickness, vitreous chamber depth, corneal power) and refractive errors.
  • To determine the differential impact of these biometrics on myopia and hyperopia.

Main Methods:

  • Cross-sectional study of 40-64 year olds in Shahroud.
  • Random cluster sampling for participant selection.
  • Ocular biometrics measured using Allegro Biograph; refractive errors determined via cycloplegic refraction.

Main Results:

  • Axial length and corneal power showed the strongest correlation with spherical equivalent.
  • Variability in spherical equivalent was largely attributed to axial length and corneal power (69.5%).
  • Vitreous chamber depth and corneal power correlations were stronger in myopes; lens thickness and anterior chamber depth correlations were stronger in hyperopes.

Conclusions:

  • Axial length and corneal power are primary drivers of spherical equivalent in high myopia and hyperopia.
  • Anterior segment biometrics play a more significant role in hyperopia compared to myopia.
  • Findings provide insights into the structural basis of refractive error in middle-aged adults.