Data for: An Analysis of Anterior Scleral Shape and its Role in the Design and Fitting of Scleral Contact Lenses

Published: 10 November 2017| Version 1 | DOI: 10.17632/289dznw7v5.1
Contributors:
Markus Ritzmann,
Rainer Boerret,
Patrick Caroline,
Emily Korszen

Description

An Analysis of Anterior Scleral Shape and its Role in the Design and Fitting of Scleral Contact Lenses Purpose In the past 15 years the demand for Scleral Contact Lenses has grown exponentially. Yet the shape of the anterior sclera has not been fully described by sagittal height and transition angles in the four cardinal and the four oblique segments individually. Materials and Methods In the study 78 normal eyes, void of any pathological changes, of 39 subjects (mean age 25.4 ±2.0 yrs.) were investigated. The sagittal height, corneoscleral angle and scleral angle were measured individually in all eight segments of the anterior eye at three chord lengths 10mm, 12.8mm and 15mm by utilizing the Visante OCT. A Medmont E300 topographer was used to quantity the corneal power and the Grand Seiko WAM-5500 to show the objective refraction. Results Significant differences were found in comparison of horizontal and vertical corneal diameter (external and internal both p < 0.0001), and in all sagittal height and scleral angle measurements at a chord of 15mm in the opposite segments (sagittal height p ≤ 0.0021; scleral angle p ≤ 0.0105). At a chord of 12.8mm the shape of the anterior eye is symmetrical and becomes slightly irregular at a chord of 15mm. The nasal hemisphere showed a flatter scleral angle and a concave transition. In the temporal hemisphere scleral angles were steeper and a rather tangential or convex transition occurred.   Conclusion These findings are relevant factors to consider in the fitting and designing of Scleral and Soft Contact Lenses in the future. Further investigations of the scleral shape beyond 15mm are required. Keywords (Max. 6 Keywords) Anterior scleral shape, scleral contact lens, soft contact lenses, sagittal height, corneo-scleral profile, Visante OCT

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Categories

Optometry, Ocular Anatomy, Ocular Imaging, Cornea, Ocular, Sclera, Adnexa of Eye, Optometry Education, Contact Lens, Contact Lenses, Cornea Imaging

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