July 2019
Volume 60, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2019
Placido topography-guided transepithelial PRK in treat asymmetric astigmatism
Author Affiliations & Notes
  • loay Daas
    Department of Ophthalmology, Saarland University Medical Center UKS, Homburg /Saar, Saarland, Germany, Homburg-Saar, Germany
  • Marija Anticic
    Department of Ophthalmology, Klinikum Klagenfurt, Austria, Klagenfurt, Austria
  • Andreas Frings
    Department of Ophthalmology, Heinrich-Heine University Düsseldorf, Germany, Germany
  • Berthold Seitz
    Department of Ophthalmology, Saarland University Medical Center UKS, Homburg /Saar, Saarland, Germany, Homburg-Saar, Germany
  • Navid Ardjomand
    Sehzentrum für Augenlaser & Augenchirurgie Graz, Austria, Graz, Austria
  • Footnotes
    Commercial Relationships   loay Daas, None; Marija Anticic, None; Andreas Frings, None; Berthold Seitz, None; Navid Ardjomand, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2019, Vol.60, 5056. doi:
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      loay Daas, Marija Anticic, Andreas Frings, Berthold Seitz, Navid Ardjomand; Placido topography-guided transepithelial PRK in treat asymmetric astigmatism. Invest. Ophthalmol. Vis. Sci. 2019;60(9):5056.

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      © ARVO (1962-2015); The Authors (2016-present)

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Purpose : Irregular corneal astigmatism is the main reason for reduced vision in patients with keratoconus or decentered ablation after excimer laser treatment. The quality of treatment in these patients has improved over the last 2 decades with all major laser platforms.
All laser companies recommend a two or three step procedure for these eyes, since the refractive outcome might be unpredictable. Herein we present our results with the Mel 90 and the CRS master (Zeiss, Jena, Germany).

Methods : 10 patients (12 eyes) with irregular corneal astigmatism underwent a single session 60 µm transepithelial PTK (optical zone 8.0 mm) and topography-guided PRK (optical zone 7.0 mm). Mitomycin 0.02% was always applied to the laser area for 30 seconds. The diagnoses were keratoconus, forme fruste keratoconus, pellucidal marginal degeneration and decentration after myopic laser treatment. The average age of the patients was 35.0±6.6 (25 - 48) years.
The subjective refraction of the patients was put into the CRS master to correct ametropia and corneal irregularity in one session.

Results : The steepest axis could be reduced from 47.0±3.2 D to 43.2±4.5 D. Coma was reduced from -0.91µ to -0.15µ. Spherical aberration did not change significantly. UCDVA increased from 1.05 to 0.9 logMAR and CDVA increased from 0.15 to 0.01 logMAR.
None of the patients lost a line of vision. The corneal pachymetry decreased from 489± 33.6µm to 435±52.2 µm.

Conclusions : Single session transepithelial topography-guided PRK with the Zeiss Mel90 and the CRS Master is a safe and predictable method to correct irregular corneal astigmatism, reduce corneal coma and increase visual acuity.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.


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