Refractive And Topographic Outcomes Of Corneal Tissue Addition Keratoplasty (Ctak)
Published 2026 - 44th Congress of the ESCRS
Reference: POCOR373 | Type: Free paper | DOI: 10.82333/mf7w-cr95
Authors: Dr Karanpreet Singh Multani 1 , Mr Michael Cheng 2 , Dr Kamran Riaz* 2
1Ophthalmology,Dean McGee Eye Institute,Oklahoma City,United States;Ophthalmology,Dean McGee Eye Institute,Oklahoma City,United States;Ophthalmology,Dean McGee Eye Institute,Oklahoma City,United States, 2Ophthalmology,Dean McGee Eye Institute,Oklahoma City,United States
Purpose
To evaluate visual, refractive, and topographic outcomes of corneal tissue addition keratoplasty (CTAK) in patients with keratoconus and post-surgical ectasia.
Setting
Single tertiary academic center.
Methods
A retrospective review was conducted of eyes undergoing CTAK at our institute. Collected variables included demographics and pre- and postoperative Pentacam topography, visual acuity, and refraction. Primary outcomes were changes in flat K, steep K, Kmax, uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA), and spherical equivalent (SE). Postoperative measurements at 1 day, 1 week, 1 month, and ≥3 months were compared with baseline.
Results
Nineteen eyes (mean age 36.3 years) were included. Preoperatively, mean Kmax was 54.8 ± 9.3 D (range 43.0–79.4), flat K 52.6 ± 9.3, steep K 57.3 ± 9.2, and astigmatism 4.7 ± 2.3. At latest follow-up (POM1 or ≥POM3), mean flat K decreased by 3.75 D, steep K by 3.94 D, and Kmax by 3.82 D, while astigmatism decreased by 0.20 D. At POM1, mean UCVA improved from 20/215 (logMAR 1.03) to 20/125 (0.80), and mean BCVA from 20/90 (0.65) to 20/60 (0.48). Mean SE improved from –3.3 ± 3.8 D to –0.47 ± 1.0 D.
Conclusions
Our findings demonstrate that CTAK produces notable improvements in corneal shape and functional vision. These results support CTAK as a reliable therapeutic option for patients with keratoconus and post-surgical ectasia.