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Refractive error effect on the agreement of a convertible posterior OCT with a Scheimpflug camera to measure the anterior eye segment

Poster Details

First Author: A.Domínguez-Vicent SWEDEN

Co Author(s):    A. Rakhimova   A. Stahl   R. Brautaset              

Abstract Details

Purpose:

To assess the effect of the refractive error in the repeatability and reproducibility of a convertible optical coherence tomographer (OCT) to measure anterior segment distances, and study its agreement with a Scheimpflug camera

Setting:

Unit of Optometry, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden

Methods:

Forty phakic and healthy eyes were included in this study, and each one was measured with a Scheimpflug camera and an OCT. Each subject was divided into the emmetropic, hyperopic, and myopic group depending on their refractive error. Regarding the OCT equipment, this is a posterior OCT that includes an anterior segment module to convert it into an anterior segment OCT. The precision and agreement of these systems were evaluated by means of anterior chamber depth (ACD), angle to angle, nasal angle, temporal angle, thinnest corneal thickness, and central corneal thickness

Results:

All in all, the repeatability limit of each system showed smaller results than the reproducibility limit for all measurements of the anterior segment within each refractive group. Regarding the agreement results, the OCT measured on average wider anterior chamber angle than the Scheimpflug system for the three refractive groups. On the contrary, the Scheimpflug camera measured on average shallower ACD and larger angle to angle than the OCT. Nevertheless, both systems measured almost the same pachymetry outcomes.

Conclusions:

The OCT and Scheimpflug systems showed good repeatability and reproducibility outcomes for all refractive groups. Nonetheless, clinical criteria are needed to judge whether these devices could be used interchangeable.

Financial Disclosure:

NONE

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