Customised aberration-controlling contact lenses for keratoconus: the story so far

Amit Jinabhai, Martin Rubinstein (Editor)

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Purpose: Technological advances have led to the design of customised, aberration-controlling soft contact lenses for keratoconic patients. These lenses are designed to reduce the magnitudes of higher-order aberrations induced through corneal apical protrusion, such as coma, trefoil and spherical aberration. This presentation reviews the limitations of such customised soft contact lens corrections. Methods: Mathematical computations were used to model the magnitude of superfluous aberrations induced through typical ‘on-eye’ rotations or translations of customised soft lenses, specifically designed for patients with mild, moderate and severe keratoconus. Results: The tolerances for on-eye lens displacements were found to be very restrictive. For optimal optical performance, lens rotations should be minimised to less than 8 degrees for patients with mild to moderate keratoconus, yet ideally less than 4 degrees for patients with severe keratoconus. Equally, vertical lens displacements ought to be minimised to 0.10 mm, or less. Conclusions: Compared to conventional, flat-fitting rigid gas-permeable (RGP) contact lenses, customised soft lenses may offer keratoconic patients improved comfort and a reduced risk of developing RGP lens-induced apical scarring. However, the typical on-eye movements of customised soft lenses are likely to hinder their optimal optical performance, thereby limiting their use to patients with early to mild keratoconus only.
    Original languageEnglish
    Title of host publicationhost publication
    EditorsMartin Rubinstein
    PublisherUniversity of Nottingham
    Publication statusPublished - 29 Jan 2016
    EventThe 20th Nottingham Eye Symposium and Research Meeting - Nottingham, UK
    Duration: 29 Jan 201629 Jan 2016

    Conference

    ConferenceThe 20th Nottingham Eye Symposium and Research Meeting
    CityNottingham, UK
    Period29/01/1629/01/16

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