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Related Experiment Videos

Corneal thickness in a population-based, cross-sectional study: the Tehran Eye Study.

Hassan Hashemi1, Kamran Yazdani, Shiva Mehravaran

  • 1Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.

Cornea
|May 5, 2009
PubMed
Summary

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This study found Iranian adults have thicker corneas than other ethnic groups. Younger age and deeper anterior chamber depth correlate with thicker central corneal thickness (CCT).

Area of Science:

  • Ophthalmology
  • Corneal Biomechanics
  • Population Health

Background:

  • Corneal thickness is a key factor in ophthalmic diagnostics and surgical planning.
  • Understanding ethnic variations in corneal thickness is crucial for accurate eye care.
  • The Tehran Eye Study provides a valuable dataset for population-based ophthalmic research.

Purpose of the Study:

  • To map the distribution of corneal thickness at six distinct points in an Iranian population.
  • To investigate potential correlations between corneal thickness and demographic/clinical variables.
  • To establish normative data for corneal thickness in this specific ethnic group.

Main Methods:

  • A stratified random cluster sampling method was used to select 410 participants (800 eyes) aged 14+ in Tehran.

Related Experiment Videos

  • Corneal thickness was measured using Orbscan II at central, thinnest, and four peripheral locations.
  • Statistical analyses assessed relationships between central corneal thickness (CCT) and age, sex, refractive error, pupil diameter, corneal diameter, anterior chamber depth (ACD), and BMI.

    • Main Results:

    • The mean central corneal thickness (CCT) was 555.6 ± 39.9 micrometers; 9.6% of participants had CCT below 500 micrometers.
    • Younger participants (<20 years) exhibited significantly thicker corneas compared to older individuals.
    • Age and anterior chamber depth (ACD) showed significant inverse correlations with CCT in the regression model.

    Conclusions:

    • The mean CCT in the Iranian population studied is higher than in other ethnic groups.
    • Age and ACD are significant predictors of CCT, while refractive errors showed no correlation.
    • These findings contribute to ethnic-specific normative data for corneal thickness.