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  • Customised corneal crosslinking with supplemental oxygen

Customised corneal crosslinking with supplemental oxygen
Reviewed by Mahmoud Ahmed

4 February 2021 | Mahmoud Ahmed | EYE - Cataract, EYE - Refractive
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In this prospective interventional case series, the authors investigate using supplemental oxygen delivery during epithelium-on corneal crosslinking (CXL) with specially designed oxygen delivery goggles. Twenty-seven eyes of 24 patients underwent epi-on CXL with Riboflavin and Ultraviolet-A irradiation. At six months follow-up, mean corrected distance visual acuity (CDVA) improved by one and two or more Snellen lines in 48% and 30% of patients respectively. The corneal higher order aberrations (HOAs) improved significantly. The mean steep keratometry (K2) showed significant flattening of -1.9 diopters. The authors hypothesise the improvement in CDVA to be due to anterior corneal surface regularisation, compensating for corneal HOAs mostly caused by posterior surface irregularity. A demarcation line indicating the depth of treatment was observed on corneal optical coherence tomography and slit-lamp examination. The authors found this line to be 30% deeper than in eyes treated with the epi-off CXL procedure. The authors indicate this is indirect evidence that supplemental oxygen effectively increases the overall epi-on treatment depth by increasing intraoperative stromal oxygen diffusion. This paper needs supplementation with longer-term follow-up and a larger cohort of cases.

Customized corneal crosslinking for treatment of progressive keratoconus: Clinical and OCT outcomes using a transepithelial approach with supplemental oxygen.
Mazzotta C, Sgheri A, Bagaglia S, et al.
JOURNAL OF CATARACT & REFRACTIVE SURGERY
2020;46:1582-7.
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CONTRIBUTOR
Mahmoud Ahmed

Royal Liverpool University Hospital, UK.

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