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Original Article

PAFMJ. 2017; 67(6): 1050-1053


Muhammad Tauseef Dildar, Muhammad Amer Yaqub, Shahzad Ali, Muhammad Kamran Saeed, Muhammad Asad Farooq.

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.

Key words: Applanation ultrasound pachymetry, Central corneal thickness, Galilei dual scheimpflug analyzer.

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