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Screening Thresholds for the Corneal Tomography in Hyperopic Pakistani Population.

Sadia Humayun1, Aisha Fawad2, Mazhar Ishaq1

  • 1Department of Refractive Surgery, Armed Forces Institute of Ophthalmology AFIO, National University of Medical Sciences, Rawalpindi, Pakistan.

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Summary

This study establishes normal corneal tomography values for screening hyperopic patients for refractive surgery in Pakistan. Hyperopic eyes show greater elevation and pachymetry but less keratometry and anterior chamber depth compared to myopic eyes.

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Area of Science:

  • Ophthalmology
  • Corneal Imaging
  • Refractive Surgery Screening

Background:

  • Corneal tomography is crucial for refractive surgery screening.
  • Establishing normative data is essential for accurate diagnosis and patient selection.
  • Previous studies primarily focused on myopic populations, necessitating data for hyperopic individuals.

Purpose of the Study:

  • To determine key corneal tomography parameters for screening hyperopic and mixed astigmatism patients for refractive surgery.
  • To compare these parameters with a previously studied myopic cohort in the Pakistani population.

Main Methods:

  • A cross-sectional, observational study was conducted at the Armed Forces Institute of Ophthalmology (AFIO) from August 2013 to August 2018.
  • The WaveLight Allegro Oculyzer II device was used to examine 106 adult hyperopic patients (209 eyes).
  • Twenty clinically relevant parameters were assessed, with normality evaluated using the Kolmogorov-Smirnov test and outliers presented as percentiles.

Main Results:

  • Normal mean anterior segment values were established for various parameters, including simulated keratometry (K1, K2, K max, K mean), astigmatism, pachymetry, front and back elevation, Ambrosio relational thickness, progression index, and anterior chamber depth.
  • Hyperopic patients exhibited greater front and back elevation and pachymetry compared to myopic patients.
  • Hyperopic patients showed lesser keratometry, anterior chamber depth, and chamber volume than myopic patients.

Conclusions:

  • Corneal tomography parameters differ between hyperopic and myopic populations in Pakistan.
  • The established normative data aids in screening hyperopic patients for refractive surgery.
  • Front and back elevation values in this hyperopic cohort were slightly higher than those reported in prior international studies.