Author: Alejandra Consejo, Wrocław University of Technology

Traditionally, the limbus has been assumed to coincide with the HVID or the white-to-white (W2W) radius estimated from 2D “en face” intensity images. Recently, a new technology based on the principle of profilometry, which has the potential of measuring the corneo-scleral topography extending the acquired area up to 20 mm diameter far beyond the limbus, has become available. Studying the 3D corneo-scleral topography is possible using this technology. Of interest was whether the 3D anterior eye scleral topography could be utilized to demarcate the limbal area based on local curvature. That topography-based limbus demarcation is not a trivial task. There are no standards. Moreover, the results depend on the limbus definition as well as the technique used for its estimation. With more advanced technologies becoming readily available, one is able to choose a specific definition of limbus (e.g., based on HVID, W2W, or topography based) suitable for his or her particular purposes. The proposed topography-based estimation of the limbus location can be particularly attractive for scleral contact lens design and fit. The first results of this study were presented in a conference poster on the Visual & Physiological Optics conference, August 2014 in Wrocław (Poland). Later on, the following steps of this work were presented at the 12th Students’ Conference, September 2014 in Boguszów-Gorze (Poland), where I achieved the first conference prize in the category Bio-chem-sphere (Images) for this work made in collaboration with my supervisor Robert Iskander.

Image 1: Oral presentation in the 12th Students’ Conference explaining the presented study “Modelling of the anterior eye topography focusing on identification of the limbal region”.

Image 2: Receiving the Bio-chem-sphere prize from Professor Zbigniew Sroka.