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Corneal inlay induces transient increase in corneal resistance factor, corneal hysteresis
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The implantation of a small-aperture corneal inlay does not cause a permanent change in corneal hysteresis or corneal resistance factor, according to a study.
The retrospective study included 34 patients who underwent Kamra (AcuFocus) implantation. Inlays were implanted in the patient’s nondominant eye, and fellow eyes served as controls. Corneal hysteresis, corneal resistance factor, Goldmann-correlated IOP, corneal-compensated IOP and IOP measured with Goldmann applanation tonometry were recorded preoperatively and postoperatively at week 1 and months 1, 3 and 6.
At 1 week and 1 month, corneal resistance factor and corneal hysteresis in the implanted eyes were statistically significantly higher compared with preoperative values and compared with the control eyes.
At 1 month, corneal-compensated IOP was statistically significantly higher compared with the preoperative value.
No significant differences were found between the two groups of eyes for Goldmann-correlated IOP or Goldmann applanation tonometry.
By 3 months, all parameters returned to baseline values and were maintained at 6 months.
“We have no explanation at this time for the transient increase in CH and CRF; however, it may have resulted from a transient increase in IOP that was statistically undetected in this study, a transient change in the corneal structure (eg, water content, edema, foreign body reaction or remodeling) or both,” the study authors said.
Disclosure: See the study for full list of all authors’ relevant financial disclosures.
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