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Study results help optimize bandage lens fit after keratoprosthesis surgery
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ORLANDO, Fla. – When only one-third of patients were successfully fit with an extended-wear hydrogel contact lens after surgery with the Boston Keratoprosthesis Type 1, those results allowed clinicians to alter the design to achieve a 63% success rate.
Julia Theodossiades, of the Contact Lens Service at the Moorfields Eye Hospital, London, and colleagues reported in a poster here at the Association for Research in Vision and Ophthalmology meeting that 16 patients at the Moorfields Eye Hospital received a methafilcon A 55% bandage contact lens at the time of surgery. The lens had a base curve of 9.8 mm and a diameter of 16 mm. Refractive errors were incorporated as required.
Theodossiades told Primary Care Optometry News that the criteria for success are a satisfactory fit, full coverage of the junction, no edge fluting and only a single mobile bubble.
She said they saw patients 1 week postoperatively, at 1 month, every month until stable, then every 2 months.
“We may remove the lens and clean or replace it,” she said. “This is lifelong lens wear for these patients.”
In this group, Theodossiades said they encountered problems with edge fluting, the lens not centering and static bubbles.
“We tried hybrid lenses, and they did not work,” she said. “We resolved the problems with a larger, steeper lens.”
The proposed protocol is to use the same material but a base curve of 8.8 mm and a diameter of 18 mm.
The authors stated in the poster that further work is required to optimize lens fits after this surgery.
“This is an evolving field,” Theodossiades concluded.
Disclosures: The authors have no financial disclosures.