A hyper-Dk piggyback contact lens system for keratoconus
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Published on: November 12, 2015
Clare O'Donnell1, Carole Maldonado-Codina
1Department of Optometry and Neuroscience, University of Manchester Institute of Science of Technology, Manchester, UK. clare.odonnell@umist.ac.uk
Purpose:
To report the fitting of a hyper-Dk piggyback contact lens system in a case of keratoconus.
Methods:
Case report.
Results:
A patient with keratoconus, suboptimal visual acuity, corneal neovascularization, and marked conjunctival hyperemia, who was intolerant of rigid gas-permeable contact lenses, was fitted with a novel piggyback contact lens system that incorporated a hyper-oxygen transmissible hydrogel contact lens, on top of which was fitted a hyper-oxygen transmissible rigid gas-permeable lens. This novel contact lens system provided a significant improvement in visual acuity, comfort, and lens wear time. There was a marked reduction in corneal vascularization and ocular hyperemia.
Conclusions:
This hyper-Dk piggyback contact lens system satisfied the ocular and visual requirements of this patient, for whom other nonsurgical options for vision correction had been unsuccessful. This system has potential application in the visual rehabilitation of other cases of corneal irregularity, including unsuccessful refractive surgery, ocular trauma, and keratoplasty. Piggyback contact lens systems require the same level of expertise to fit as basic forms of soft and rigid contact lenses. The hyper-oxygen transmissible lens materials available make these dual-lens systems a viable option for the compromised cornea.
