Muhammad Tauseef Dildar, Muhammad Amer Yaqub, Shahzad Ali, Muhammad Kamran Saeed, Muhammad Asad Farooq.
Comparison of Central Corneal Thickness Measurements with the Galilei Dual Scheimpflug Analyzer and Ultrasound Pachymetry.
Pak Armed Forces Med J Jan ;67(6):1050-3.

Objective: To determine the correlation between mean central corneal thickness taken with Galilei dual Scheimpflug Analyzer and Applanation Ultrasound Pachymetry. Study Design: Descriptive cross sectional study. Place and Duration of Study: Armed Forces Institute of Ophthalmology Rawalpindi, from Jul 2013 to Jan 2014. Material and Methods: Central corneal thickness was measured in 100 eyes of 50 patients. First three readings were taken with Galilei dual Scheimpflug analyzer, with a gap of 1 minute. Then three readings were taken with ultrasound pachymetry after applying topical 0.5% proparacaine (Alcain). the mean of the three readings was used for the analysis. Results: For right eye the mean central corneal thickness measured by the Galilei dual Scheimpflug analyzer and Ultrasound pachymetry was 544.06µm ± 27.36 and 546.88µm ± 27.71 respectively, and for left eye it was 544.72µm ± 25.47 and 546.52µm ± 26.15 respectively. There was a strong and positive correlation between the two instruments (r=0.969, p=0.000 for right eye and r=0.956, p=0.000 for left eye). Conclusions: the pachymetry readings with GSA showed strong and positive correlation with those of US pachymetry. So GSA may be considered as an alternative to US Pachymetry, thus avoiding operator-dependent errors, patient discomfort and other disadvantages.

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