Levelling the Eye to Provide a More Accurate Ocular Shape for Comparative Analysis and Contact Lens Fitting



Abass, AMFF ORCID: 0000-0002-8622-4632, White, L, Jones, Steve, Elsheikh, A and Clamp ​, J
(2017) Levelling the Eye to Provide a More Accurate Ocular Shape for Comparative Analysis and Contact Lens Fitting. [Poster]

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Abstract

Topography maps play an important, increasing role in contact lenses design and fitting, particularly for large diameter lenses. Whenever an eye is measured using a topography machine, the fixation point is required to be in the machine head, around 2 to 10 cm in front of the eye. This practice induces rotation of the eye which can result in tilted maps, affecting measurement accuracy. Additionally, this measurement is necessarily around the visual axis whereas the geometric axis is more important for ocular shape measurements. It is not a simple matter to compensate for this induced error, as the eye itself has few, if any, identifiable characteristics to facilitate correct orientation. This study developed methodologies to level the eye topography data around its geometrical axis, thus providing more accurate information regarding ocular shape.

Item Type: Poster
Depositing User: Symplectic Admin
Date Deposited: 15 Jun 2017 10:40
Last Modified: 02 Apr 2021 08:14
Open Access URL: https://www.researchgate.net/publication/312489498...
URI: https://livrepository.liverpool.ac.uk/id/eprint/3007998