EXTENDED REPORT

Automated superficial lamellar keratectomy augmented by excimer laser masked PTK in the management of severe superficial corneal opacities

J L Alio¹, J Javaloy¹, J Merayo³ and A Galal²

¹ Instituto Oftalmológico de Alicante (Department of Cornea and Refractive Surgery) and Department of Ophthalmology, Miguel Hernández University, Medical School, Alicante, Spain
² Clinical fellow at the Instituto Oftalmológico de Alicante (Department of Cornea and Refractive Surgery), Miguel Hernández University, School of Medicine, Alicante, Spain
³ Insituto de Oftalmobiología Aplicada. Universidad de Valladolid. Spain

Correspondence to:
Correspondence to:
Dr J L Alió
Instituto Oftalmológico de Alicante, C/Cabañal, 1, 03016 Alicante, Spain; jlalio{at}oftalio.com

Aim: To assess superficial lamellar keratectomy augmented by excimer laser smoothening with sodium hyaluronate 0.25%, for the management of superficial corneal opacities.

Methods: Consecutive procedure performed in 14 eyes (13 patients) with an automated microkeratome and excimer laser phototherapeutic keratectomy (PTK) smoothening using sodium hyaluronate 0.25%. Main outcome measures: UCVA, BCVA, pachymetry, degree of haze, ray tracing analysis, and complications. Mean follow up was 12 (SD 1.6) months.

Results: Mean preoperative haze from previous corneal refractive surgeries was 3.5 (SD 0.5) (11/14 cases). In one case, opacity was caused by ocular trauma and in two by infectious keratitis. The mean preoperative UCVA was 0.7 logMAR (0.2 (SD 0.13) decimal value). BCVA was 0.4 logMAR (0.4 (SD 0.17) decimal value). Mean preoperative corneal pachymetry was 508 (SD 62.5) µm and mean opacity depth measured by corneal confocal microscopy was 115.2 (SD 49.4) µm. At 6 months, 71.4% of the eyes with previous corneal refractive surgery showed grade I haze or less. Mean postoperative corneal pachymetry at 6 months was 352.36 (SD 49.05) µm.

Conclusions: Automated superficial lamellar keratectomy combined with excimer laser PTK smoothening assisted by sodium hyaluronate 0.25% induces a significant improvement of corneal transparency and visual acuity in cases of corneal opacity caused by previous refractive surgery, ocular trauma, and keratitis.

Abbreviations: BCVA, best corrected visual acuity; CMTF, confocal microscopy through focus; ID, image distortion; LASIK, laser assisted in situ keratomileusis; PRK, photorefractive keratectomy; PTK, phototherapeutic keratectomy; RK, radial keratotomy; SCSQ, superficial corneal surface quality; UCVA, uncorrected visual acuity

Keywords: lamellar keratectomy; irregular astigmatism; corneal opacity; PTK

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