Posters

Characterisation of the corneoscleral morphology according to different refractive defect in normal subjects

Poster Details

First Author: L.Bataille SPAIN

Co Author(s):    A. Martínez-Abad   D. Piñero Llorens                 

Abstract Details

Purpose:

To analyze the corneoscleral morphology differences between myopes, emmetropes and hypermetropes.

Setting:

Department of Optics, Pharmacology and Anatomy, University of Alicante VISSUM INNOVATION, Alicante, Spain.

Methods:

This is a prospective case series including 67 healthy eyes of 67 patients with an age ranging from 21 to 69 years. Three groups were differentiated: myopia, including 32 eyes with mean spherical refraction -2.55 D (range, -8.00 to -0.25 D), emmetropia, including 21 eyes with plano spherical refraction, and hyperopia, including 14 eyes with mean spherical refraction 1.56 D (range, 0.25 to 5.25 D). A complete ocular examination was performed including an analysis of the corneoscleral topographic profile with the Fourier transform profilometer Eye Surface Profiler (Eaglet-Eye, Houten, the Netherlands). Differences between groups were evaluated for different sclero-corneal parameters.

Results:

Statistically significant differences were found between refractive groups for minimum sagittal heights calculated for 12-mm (myopia: 2.26±0.17 mm, emmetropia: 2.18±0.23 mm, hyperopia: 2.12±0.10 mm; p=0.017) and 13 mm (myopia: 2.61±0.21 mm, emmetropia: 2.56±0.23 mm, hyperopia: 2.40±0.20 mm; p=0.017; p=0.009) corneal chords. In contrast, no significant differences between groups were found in corneal and scleral radius as well as in the best fit sphere for the corneal, limbar and scleral areas (p>0.05). In all groups the sagittal heights were significantly correlated with flattest keratometry, inner Best-fit Sphere and corneal diameter (R2: 0.70, P< 0.000).

Conclusions:

Higher sagittal heights are present in myopic eyes compared to emmetropic and hyperopic eyes mainly attributable to differences in the geometric distribution of the cornea as no differences were detected in anterior scleral geometric data. More studies are needed to corroborate these outcomes including more scleral geometric data in larger sample sizes. Likewise, the potential usefulness of this new analysis to predict myopic changes should be investigated further.

Financial Disclosure:

None