Through iterative observation and refinement of classification criteria-partly taken from the literature-all eyes were designated a specific topographic diagnosis, i.e., circumventing the usage of the expression KC 'suspect'. Scissoring on retinoscopy, loss of best spectacle-corrected visual acuity, and iron ring depo-sition were looked for. Features of steepness, inferior–superior asymmetry, focal steepening, thinning, and bounded anterior or posterior elevations are observed in the quad map. Methods Pentacam corneal topographies of 199 consecutive refractive surgery candidates (398 eyes) are examined. We intend to subclassify such topographies in meaningful and informative designations. Purpose The term 'keratoconus (KC) suspect' is used as a blanket term to refer to any deviation of virgin cornea shape toward KC features. Validation of these findings in larger data sets using the methodology described may improve the predictability of current LASIK nomograms, particularly in eyes with high myopia. Eyes with flatter corneas tended to have greater undercorrection than eyes with similar myopia and steeper corneas. This difference was statistically significant in eyes with a preoperative SE of –10.0 to –10.9 D and –11.0 to –11.9 D.Conclusions: Preoperative keratometry appeared to influence the refractive outcome after myopic LASIK. When eyes were stratified by the degree of preoperative myopia in 1.0 D steps, a trend toward greater undercorrection was noted in eyes with preoperative keratometry 44.5 D) in all myopia groups except the –7.0 to –7.9 D group. ![]() ![]() ![]() Mean preoperative keratometry was 43.9 ± 1.5 D (range 40.3 to 48.1 D). Three months after surgery, SE refraction was –0.04 ± 1.1 D (range +2.3 to –3.3 D) uncorrected visual acuity ≥20/40 was present in 91.8% of 110 eyes in which emmetropia was the postoperative goal. Preoperative myopic spherical equivalent (SE) refraction was –9.0 ± 2.0 D (range –6.0 to –13.9 D). To evaluate the effect of preoperative keratometry on the refractive outcome after laser in situ keratomileusis (LASIK) for myopia.Setting: University Eye Clinic, Prince of Wales Hospital, Hong Kong, China.Methods: In this retrospective study, the records of patients who had LASIK for myopia greater than –6.0 diopters (D) using the Chiron Automated Corneal Shaper and the Schwind Keratome-F excimer laser were reviewed.Results: Laser in situ keratomileusis was performed in 167 eyes of 103 patients (mean age 34.7 years ± 7.5 ).
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