Nicholas Gidosh
Lehigh Valley Eye Care Associates, USA
Title: Toric orthokeratology contact lenses for patients with corneal elevation differences
Biography
Biography: Nicholas Gidosh
Abstract
Orthokeratology is a well-established process by which the corneal surface is reshaped in order to correct refractive
ametropia through the use of specific contact lens designs. Orthokeratology lenses are reverse geometry lenses specially
designed to have very low clearance over the pupil. These designs are comprised of different zones to either provide treatment
or stabilize the lens and can be organized into two broad categories: corneal refractive therapy (CRT, Paragon vision sciences,
Inc.) or vision shaping treatment (VST, Bausch + Lomb). This lecture will review fundamentals in orthokeratology as well
as troubleshooting common problems faced in practice. The presentation will then discuss more advanced design options
available to apply ortho-k fitting to more patients by focusing on toric designs as well as describing other ways of customizing
a fit. This will be done through discussion of elevation data obtained through a corneal topographer including how to measure
the values and apply it when designing an orthokeratology lens. Topographical data is critical in understanding the shape of a
patient’s corneal surface and thereby designing an appropriately fitting contact lens. Topographical maps will be discussed and
analyzed to explain how to troubleshoot different problems and guide custom lens design.