No change seen in binocular contrast sensitivity after inlay procedure

NEW ORLEANS – A mild decrease in monocular contrast sensitivity was seen after Kamra inlay implantation, but binocular contrast sensitivity “remained essentially unchanged,” according to a poster presented here at the American Academy of Optometry meeting.

Srividhya H. Vilupuru , OD, PhD, and colleagues reported that the degree of reduction in monocular contrast sensitivity in their study was similar to that typically found after LASIK.

Their study involved 335 subjects who were part of the investigational device exemption trial for the Kamra inlay (AcuFocus Inc., Irvine, Calif.). The researchers said they tested four spatial frequencies at photopic and mesopic conditions with and without glare. The contrast sensitivity function was measured before the inlay procedures as well as 3, 6, 12, 24 and 36 months postoperatively.

Vilupuru and colleagues reported some reduction in contrast sensitivity after surgery under monocular photopic and mesopic without glare conditions; however, it appeared stable out to 3 years postoperatively.

Overall contrast sensitivity function loss was 5% to 10% in monocular conditions and 1% to 4% in binocular conditions, they said.

“The monocular postoperative contrast sensitivity remained within the established normative range through 36 months postoperative,” the authors concluded. “Also, in comparing the contrast sensitivity of the Kamra inlay to that of multifocal intraocular lenses, subjects implanted with the Kamra inlay demonstrated better contrast sensitivity at 6 months postoperative.” – by Nancy Hemphill, ELS, FAAO

Disclosures: Vilupuru is manager of clinical research for AcuFocus. Ling Lin, PhD, is senior manager of biostatistics, clinical research at AcuFocus. Corina van de Pol, OD, PhD, is a consultant for AcuFocus.