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Corneal wave front guided trans PRK and trans PTK procedures with simultaneous corneal cross-linking for the visual rehabilitation of keratoconus patients

Poster Details

First Author: V.Suvajac SERBIA

Co Author(s):    G. Suvajac   K. Savić                 

Abstract Details


To report our initial results of corneal wave front guided trans PRK procedures and trans PTK procedures with simultaneous corneal cross-linking for the regularization of corneal surface and visual rehabilitation of patients with keratoconus with insufficient CVDA and contact lens intolerance


Private Eye Hospital, Belgrade, Serbia


Six eyes with sufficient stromal thickness underwent customized corneal wave front trans PRK with simultaneous corneal cross-linking. Six eyes with insufficient stromal thickness for customized corneal wave front ablation underwent trans PTK procedure with simultaneous corneal cross linking. The depth of trans PTK ablation was determined based on epithelium and stromal thickness over the cone in each case individually. EXCIMER procedures were done with Schwind Amaris 1050 platform. Preoperative and six to twelve months postoperative corrected and uncorrected visual acuity, corneal and total higher order aberrations, corneal coma, corneal apex keratometry, and vertical corneal asymmetry were analyzed.


In transPRK group average preoperative values were UDVA 0.1 (decimal); CDVA 0.43; apex keratometry 54.5; corneal asymmetry 7.11; ocularHOA 2.66; cornealHOA 2.95. Six months postoperatively values were 0.6; 0.85; 49.5: 3.73; 1.34; 1.76. One eye gained one line, two gained four lines, one gained five, and one gained six lines of CDVA. In transPTK group preoperative values were UDVA 0.16; CDVA 0.4; apex keratometry 58.62; corneal asymmetry 8.54; ocularHOA 2.89; cornealHOA 3.37. Six months postoperatively values were: 0.36 ; 0.68; 56.44 ; 6.70; 2.13; 3.16. Two eyes gained two lines, two gained three and two gained four lines of CDVA.


Both procedures regularized corneal surface, improved both CDVA and UDVA, flattened the maximum K values, significantly reduced corneal coma, corneal HOA, total HOA and corneal asymmetry and were successful in visual rehabilitation of these patients. The reduction and visual improvement was more pronounced in trans PRK group compared to trans PTK group. Longer follow up is necessary to confirm stability and absence of ectasia progression.

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