Evaluating Optical Quality of a New Hydrophilic Enhanced Monofocal Intraocular Lens and Comparison to the Monofocal Counterpart: An Optical Bench Analysis.

Abstract

The aim of the study was to analyze the optical properties of a new hydrophilic enhanced monofocal intraocular lens (IOL) using optical bench analysis and compare it with its monofocal counterpart. This laboratory study investigates the enhanced monofocal intraocular lens (L-333) and the monofocal counterpart (L-313) IOL by Teleon Surgical, Spankeren, Netherlands on the optical bench, using OptiSpheric IOL PRO2 (Trioptics, Germany) in order to assess the optical quality according to ISO11979 with ISO-2 Cornea. IOLs (power 22.0D) were evaluated regarding through frequency modulation transfer function (MTF), Strehl ratio (SR), and through focus MTF at 50lp/mm using a 3.0-mm and a 4.5-mm aperture. Tilt and decentration were applied. In addition, wavefront measurements were obtained using WaveMaster® IOL2 device (Trioptics, Germany) and analyzed. Centered: The MTF (mean) at 50lp/mm (L-333/L-313) with 3.0mm aperture was 0.606/0.724 and with 4.5mm aperture 0.330/0.409. The SR (mean) with 3.0mm aperture was 0.586/0.809 and with 4.5mm aperture 0.330/0.348. Decentered by 1mm: The MTF (mean) at 50lp/mm (L-333/L-313) with 3.0mm aperture was 0.485/0.705 and with 4.5mm aperture 0.255/0.374. The SR (mean) with 3.0mm aperture was 0.457/0.739 and with 4.5mm aperture 0.185/0.268. Tilted by 5degrees: The MTF (mean) at 50lp/mm (L-333/L-313) with 3.0mm aperture was 0.577/0.657 and with 4.5mm aperture 0.345/0.336. The SR (mean) with 3.0mm aperture was 0.583/0.702 and with 4.5mm aperture 0.269/0.237. In through focus MTF and aperture of 3.0mm, the L-333 showed a peak of 0.41 with some enlarged depth of power of about 2D. For the aperture of 4.5mm, the MTF values of L-313 and L-333 were slightly reduced; L-333 showed an MTF peak of 0.23 and some reduced depth of power of about 1.5D. Wavefront measurements showed no major aberrations for the L-313, while a combination of moderate increase in Z 4-0 and Z 6-0 with opposite sign was revealed for the L-333. The enhanced monofocal Lentis Quantum (L-333) produces some enlarged depth of focus by combining spherical aberration of different order and opposite sign. The Lentis Quantum performs very well in comparison to the aspherical monofocal counterpart owing to its optical design. Results with large apertures were sufficient too, suggesting that the lens isa good option in eyes with a wide pupil and thus in refractive surgeries of young patients.