Blaylock JF, Hall B. Clinical outcomes of a diffractive trifocal intraocular lens with femtosecond laser, digital tracking, and intraoperative aberrometry. Can J Ophthalmol. 2022;57(5):291-296.


To determine if intraoperative aberrometry (IA) improves astigmatic outcomes for trifocal toric IOL (TTI) cases.


This was a retrospective, single-surgeon study examining 200 eyes of 100 bilaterally implanted patients. Eligible participants were those presenting with visually significant cataracts or as a candidate for clear lens extraction who were interested in implantation of a diffractive toric or non-toric intraocular lens. Preoperative and postoperative data were collected for manifest refraction spherical equivalent (MRSE), refractive astigmatism (RA), and monocular uncorrected distance visual acuity (UDVA), uncorrected intermediate visual acuity (UIVA), and uncorrected near visual acuity (UNVA).


Mean postoperative MRSE was 0.006 ± 0.27 D. The absolute prediction error was 0.50 D or less in 88.0% (176/200) of eyes. Postoperative RA was 0.50 D or less in 98.5% (197/200) of eyes. Postoperative UDVA was 0.10 logMAR or better in 86% (172/200) of eyes, and 66.0% (132/200) of eyes were 0.00 logMAR or better. Postoperative UIVA was 0.10 logMAR or better in 99.5% (199/200) of eyes, and 95.0% (190/200) of eyes were 0.00 logMAR or better. Postoperative UNVA was 0.10 logMAR or better in 91.5% (183/200) of eyes, and 73.5% (147/200) of eyes were 0.00 logMAR or better.


The results demonstrate that trifocal implantation with FLACS, DT, and IA can provide excellent refractive and visual outcomes.

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The Sengi team is led by Dr. Brad Hall, a vision scientist and expert medical writer. A regular peer reviewer for several medical and ophthalmology journals, Dr. Hall has authored a multitude of articles personally, is a successful grant writer, medical writer, and master of the art of simplifying data and statistical analysis. Since launching in 2015, Sengi has provided medical writing and biostatistics analysis expertise to SMBs and researchers around the world that lacked the necessary means to share their scientific breakthroughs outside of the lab. Sengi’s work has enabled these companies to put advanced technology into the hands of those who need them most.