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Screening Thresholds for the Corneal Tomography in Hyperopic Pakistani Population

Author(s)
Sadia Humayun Department of Refractive Surgery, Armed Forces Institute of Ophthalmology AFIO, National University of Medical Sciences,Rawalpindi, Pakistan
Aisha Fawad Department of Eye, Combined Military Hospital, Armed Forces Postgraduate Medical Institute, Rawalpindi, Pakistan
Mazhar Ishaq Department of Refractive Surgery, Armed Forces Institute of Ophthalmology AFIO, National University of Medical Sciences,Rawalpindi, Pakistan
Quratulain Humayun Department of Child and Family Asthma Studied Centre, Women and Children’s Hospital of Buffalo, New York, USA
Sabahat Arzoo Department of Refractive Surgery, Armed Forces Institute of Ophthalmology AFIO, National University of Medical Sciences,Rawalpindi, Pakistan
Syed Fawad Mashhadi Department of Community Medicine, Army Medical College, Rawalpindi, Pakistan
Abstract
Objective: To evaluate key corneal tomography parameters for screening mixed astigmatism and hyperopic males and females for refractive surgery and to compare the data to a previously studied myopic group in Pakistani population. Study Design: Cross-sectional, observational study. Methodology: WaveLight Allegro Oculyzer II diagnostic device was used to examine eyes of 106 adult hyperopic patients in order to determine normal values of 20 parameters, which are considered most clinically applicable for refractive surgery screening. Kolmogorov-Smirnov test was used to evaluate normality of data. Results for outliers were displayed as 2.5%, 5%, 95% and 97.5% percentiles. Results: Two hundred and nine eyes were examined; 110 men and 99 women with overall mean age of 31+11.7 years. Normal mean anterior segment values included: at simulated keratometry (K1) 42±.11.84 diopters (D), steep K2 43.8± 1.93 D, K maximum 44.4 ± 1.93 D, K mean 42.9 ± 1.75 D, astigmatism -1.3 ± 1.75 D, pachymetry at thinnest point 546.9 ± 33.3 um, front elevation at thinnest point 5.2 ± 3.47 um, and at the back was 14.1 ± 6.60 um, Ambrosio relational thickness maximum 472.0 ± 88.73, progression index (PI) maximum 1.2 ± 0.18, and anterior chamber depth (ACD) 2.7 ± 0.35 mm. Conclusion: Hyperopic patients had greater front and back elevation and pachymetry but lesser keratometry, anterior chamber depth and chamber volume as compared to myopic patients in Pakistani population. Front and back elevation data in this hyperopic study population was slightly higher than previously published studies.
Publication Details
Page(s) 951-955
DOI DOI not available
Published Journal: Journal of College of Physicians and Surgeons--Pakistan : JCPSP, Volume: 30, Issue: 9, Year: 2020

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Keywords
Screening, Refractive surgery, Corneal tomography, Hyperope
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