Excellent Functional Results for the Rayner C-flex® and Superflex® Aspheric, Aberration-Neutral Monofocal IOL
Posted on 04/06/2015
Rayner’s C-flex® and Superflex® aspheric and aberration-neutral monofocal intraocular lenses (IOLs) have been proved to “provide good and predictable functional results”, as the authors of a prospective clinical trial conclude in a recently published paper.
The trial, conducted by Khoramnia R et al. from the International Vision Correction Research Centre (IVCRC) at the University of Heidelberg, Germany, included 47 eyes of 34 cataract patients aged 43 to 80 years. 40 eyes were provided with a C-flex® 970C and seven eyes with a Superflex® 920H IOL, depending on the refractive error which had to be compensated. The target was emmetropia for 41 eyes while for six eyes the surgeons aimed for a myopic target refraction of >–1.0 D.
Outcome examinations have been accomplished two to four months post-surgery with excellent results as follows:
• Post-surgery the median uncorrected distance visual acuity (UDVA – according to the ETDRS chart) was 0.08 logMAR in all 41 eyes allocated for emmetropia. More than 80% of all 47 eyes reached an UDVA of 0.20 logMAR or better.
• Median corrected distance visual acuity (CDVA) increased in all 47 eyes pre- to post-surgery from +0.30 logMAR to –0.08 logMAR. 83.0% of the eyes reached a CDVA of 0.00 logMAR and 100% of +0.20 logMAR or better.
• Median spherical equivalent was –0.25 D post-surgery while the median difference between intended and actual achieved spherical equivalent was +0.06 D only (Holladay-1-formula).
• Median total higher-order aberrations (HOA) root-mean-squares (RMS) at 6 mm pupil size were +0.66 µm and the median spherical aberrations were –0.36 µm.
• Median value for stray light was 1.21 log(s) and contrast sensitivity was within the normal range.
• Patients’ satisfaction was very high with only few patients who reported marginal visual problems in bright light.
Within a literature search the authors found that results of this trial match well with the results of other comparable studies or even exceed them. This was true - for example - for the median difference between intended and then achieved spherical equivalent; in this trial 98% (72%-97% in other studies) respectively 77% (45%-80% in other studies) of the eyes met the target refraction within the relevant limits of ≤1.0 D respectively ≤0.50 D.
Thus the refractive power of C-flex® and Superflex® IOLs can be accurately calculated before surgery.
The complete paper is available here.
