In-vitro assessment of a novel intraocular lens made of crosslinked polyisobutylene

Abstract

Purpose: To describe and analyse the particularities of the material and the optical quality of the first intraocular lens (IOL) (Eyedeal® lens) made of crosslinked polyisobutylene (xPIB).

Methods: We assessed the material quality using an accelerated ageing process (to provoke glistenings) and compared values with a control, AcrySof® lens. Using the sessile drop method, the contact angle of the new IOL was measured. Images of the lens surface were recorded by scanning electron microscopy (SEM). Optical quality was assessed by measuring the labeled power and modulation transfer function (MTF) using standard metrology equipment (OptiSpheric IOL PRO2).

Results: The Eyedeal® lens had an average glistening density result of 7.46 ± 3.78 MV/mm² compared to the control AcrySof® whose glistenings number was 142.42 ± 72.47 MV/mm². The contact angle was 97.2° whereas the angle of AcrySof material is between 73.3 ± 2.4° and 84.4 ± 0.1°. Using SEM, Eyedeal® lenses were examined and all appeared to be comparable to modern IOLs made of acrylic materials. The power and MTF values were normal and conformed to ISO standards.

Conclusions: In the laboratory, the new Eyedeal® lens showed equivalence to current hydrophobic- or hydrophilic-acrylic lens models. It showed superiority in its glistening density result compared to the control lens.

Keywords: Chemical structure; Contact angle; Crosslinked polyisobutylene (xPIB); Glistenings; Intraocular lens (IOL) material; Optical quality.