Format

Send to

Choose Destination
See comment in PubMed Commons below
Invest Ophthalmol Vis Sci. 2013 Aug 28;54(8):5908-12. doi: 10.1167/iovs.13-12133.

Ultrasound-enhanced penetration of topical riboflavin into the corneal stroma.

Author information

1
Department of Ophthalmology, University of California, San Francisco, California 94143-0730, USA.

Abstract

PURPOSE:

To determine whether ultrasound treatment can promote the permeation of topical riboflavin into the corneal stroma.

METHODS:

Fresh cadaveric rabbit eyes with intact epithelium were left for 45 minutes in riboflavin 0.1% solution and divided in the following groups: A--untreated, epithelium-on; B--ultrasound-treated (1 W/cm(2) at 880 kHz for 6 minutes) with epithelium-on; and C--epithelium-off (no ultrasound). Eyes were removed from the riboflavin solution, corneas were excised, and group B was divided into B1 (with epithelium maintained) and B2 (epithelium removed for the fluorescence analysis). Confocal microscopy was performed to quantify the fluorescence intensity in the cornea according to the distance from the surface (with epithelium in groups A and B1; without epithelium in groups B2 and C).

RESULTS:

The average fluorescence intensity of riboflavin at a depth of 100, 150, 200, and 250 μm was 69.97, 58.83, 49.23, and 41.72 arbitrary units (A.U.) in group A, respectively; 255.26, 206.01, 159.81, 124.20 A.U. in group B1; 218.90, 177.90, 141.43, 110.45 A.U. in group B2; and 677.64, 420.10, 250.72 and 145.07 A.U. in group C. The difference in fluorescence was statistically significant between groups A and B1 (P = 0.001) and groups B2 and C (P < 0.0001).

CONCLUSIONS:

Ultrasound treatment increased the entry of topical riboflavin into the corneal stroma despite the presence of a previously intact epithelial barrier. This approach may offer a means of achieving clinically useful concentrations of riboflavin within the cornea with minimum epithelial damage, thereby improving the risk profile of corneal cross-linking procedures.

KEYWORDS:

cornea; drug delivery systems; phonophoresis; riboflavin; ultrasonics

PMID:
23920369
PMCID:
PMC3757909
DOI:
10.1167/iovs.13-12133
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Silverchair Information Systems Icon for PubMed Central
    Loading ...
    Support Center