Screening Thresholds for the Corneal Tomography in a Myopic Pakistani Population. 
To evaluate key corneal tomography parameters for screening refractive surgery patients in Pakistani population.  Cross-sectional, observation study.  Armed Forces Institute of Ophthalmology AFIO, National University of Medical Sciences, Rawalpindi, Pakistan, from August 2013 to December 2016.  Myopic patients were evaluated by two separate observers on Allegro OculyzerII (Wavelight) for normal ocular examination.  A total of 20 tomographic parameters, used for pre-refractive surgical evaluation, were included.  Normality of data was evaluated using Kolmogorov-Smirnov test.  Results for outliers were displayed as 2.5%, 5%, 95% and 97.5% percentiles.  The sample of 451 patients (895 eyes), comprised of 61% (n=277) females and 39% (n=174) males (39%).  The mean age was 26 +6.4 years (range of 18-62 years, M=F).  Normal mean anterior segment values included; flat simulated keratometry (K1) 42.9 ±1.44 diopters (D), steep K2 43.9 ±1.52 D, K mean 43.4 ±1.43 D, K maximum 44.6 ±1.56 D, astigmatism -0.96 ±0.97 D, anterior chamber depth (ACD) 3.19 ±0.28 mm, front elevation at the thinnest point 4.11 ±2.44 um, and that at the back was 7.56 ±4.52 um progression index (PI) maximum 1.14 ±0.17, Ambrosio relational thickness maximum (ART max) 487.5 ±89.0 and pachymetry at thinnest point 542.2 ± 31.1 um.  The study demonstrates key corneal tomography parameters, which can be useful for screening refractive surgery patients in Pakistani population.