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Corneal epithelial thickness mapping by fourier-domain optical coherence tomography in normal, keratoconic and forme fruste keratoconus eyes

Session Details

Session Title: Cornea Medical

Session Date/Time: Monday 07/10/2013 | 08:00-10:00

Paper Time: 09:22

Venue: Elicium 1 (First Floor)

First Author: : C.Temstet FRANCE

Co Author(s): :    V. Borderie   E. Basli   N. Bouheraoua   O. Sandali   L. Laroche  

Abstract Details

Purpose:

To investigate whether OCT epithelial mapping may improve detection of forme fruste keratoconus.

Setting:

Retrospective study/ Eye center (CHNO Quinze-Vingts Hospital), Paris, France

Methods:

We retrospectively reviewed the OCT RTVue 5.5 (Optovue, Fremont, CA), Orbscan IIz (Bausch & Lomb, Rochester, NY), and Pentacam Scheimpflug system 1.15 (Pentacam Comprehensive Eye Scanner Oculus Optikgerate GmbH) data from 62 eyes from 62 patients with normal cornea (control group, n= 21), forme fruste keratoconus (n =21), and keratoconus (n =20). Forme fruste keratoconic corneas featured normal slit-lamp examination, normal Orbscan data (K‹47D, I-S‹1.4) and negative Pentacam indices (KI, KCI, and TKC) with evidence of keratoconus in the contralateral eye. Keratoconic corneas were characterized by presence of clinical signs, K ›47D, I-S›1.4 and positive KI, KCI, and TKC. A pachymetry+Cpwr scan pattern (6 mm scan diameter, 8 radials, 1024 axial scans each, repeated 5 times) centered at the pupil center was used to map both the corneal and epithelial thickness.

Results:

There were no significant differences in K, I-S, KI, KCI, and TKC indices between the forme fruste group and the control group (p›0.05). The average epithelial thickness in the thinnest corneal zone was 49.3±3.8 µm in forme fruste keratoconic corneas, 42.4± 4.4 µm in keratoconic corneas, and 54.2±3.4 µm in normal corneas (ANOVA, p<0.0001). Compared with normal and keratoconic corneas, forme fruste corneas featured, respectively, significantly lower and higher epithelial thickness in the thinnest corneal zone (p<0.0001).

Conclusions:

The epithelial thickness in the thinnest corneal zone provided by the OCT epithelial mapping may be useful for early diagnosis of forme fruste keratoconus.

Financial Interest:

NONE