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A fluorophotometric comparison of anterior chamber riboflavin delivery via corneal application and fornix instillation

We investigated whether riboflavin self-administration by patients could be a feasible option for corneal cross-linking, given the considerable resources required to impregnate the cornea with riboflavin. We analysed whether administering riboflavin in the inferior fornix (the site of self-administr...

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Published in:Archivos de la Sociedad Española de Oftalmología (English ed.) 2023-11, Vol.98 (11), p.627-632
Main Authors: Iselin, K.C., Bachmann, L.M., Thiel, M.A., Sanak, F., Baenninger, P.B., Kaufmann, C.
Format: Article
Language:English
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Summary:We investigated whether riboflavin self-administration by patients could be a feasible option for corneal cross-linking, given the considerable resources required to impregnate the cornea with riboflavin. We analysed whether administering riboflavin in the inferior fornix (the site of self-administration) results in non-inferior riboflavin concentrations as when applied directly on the cornea (the site of administration by medical personnel). We conducted a prospective study to evaluate riboflavin concentrations at six time-points (baseline, 5, 15, 30, 45 and 60min) in 18 healthy volunteers for each of two application sites: cornea and fornix. Anterior chamber riboflavin (Peschke® TE 0.25%) concentrations were measured by fluorophotometry (Fluorotron™ Master FM-2). For the two application sites cornea and fornix, participants did not differ in terms of age and sex. At baseline, the autofluorescence in the anterior chamber was 16.7ng/mL (SD 5.5) and 14.6ng/mL (SD 4.6) (P=.221). After 30min, anterior chamber fluorescein concentrations had risen to 55.1ng/mL (SD 25.5) and 46.1ng/mL (SD 25.1) (P=.293) without a further relevant increase by 60min. This study found that applying riboflavin drops in the inferior fornix was non-inferior to applying it directly to the cornea, based on fluorophotometric measurements of anterior chamber riboflavin concentrations. This suggests that self-application of riboflavin is feasible in terms of corneal riboflavin impregnation. Investigamos si la auto-administración de riboflavina por parte de los pacientes podría ser una opción viable para el cross-linking corneal, teniendo en cuenta los importantes recursos necesarios para la impregnación de la córnea con riboflavina. Analizamos si administrar la riboflavina en el fornix inferior (lugar de auto-administración) resulta en concentraciones de riboflavina no inferiores a cuando se aplica directamente en la córnea (lugar de administración por personal médico). Realizamos un estudio prospectivo para evaluar las concentraciones de riboflavina en seis puntos de tiempo (basal, 5, 15, 30, 45 y 60min) en 18 voluntarios para cada uno de los dos lugares de aplicación: córnea y fornix. Las concentraciones de riboflavina (Peschke® TE 0.25%) en la cámara anterior fueron medidas por fluorofotometría (Fluorotron™ Master FM-2). En los dos lugares de aplicación, córnea y fórnix, se observó una autofluorescencia de 16,7ng/mL (DE 5,5) y 14,6ng/mL (DE 4,6) al inicio de la serie de mediciones (P=,2
ISSN:2173-5794
2173-5794
DOI:10.1016/j.oftale.2023.09.002