Abstract
BackgroundTo establish clinical expectations when using the Lenstar LS 900® dual-zone automated keratometer for surgery planning of toric intraocular lenses.MethodsFifty eyes were measured with the Lenstar LS 900® dual-zone automated keratometer . Surgical planning was performed with the data from this device and the known surgically induced astigmatism of the surgeon. Post-operative refractions and visual acuity were measured at 1 month and 3 months.ResultsClinical outcomes from 43 uncomplicated surgeries showed an average post-operative refractive astigmatism of 0.44D ±0.25D. Over 70% of eyes had 0.50D or less of refractive astigmatism and no eye had more than 1.0D of refractive astigmatism. Uncorrected visual acuity was 20/32 or better in all eyes at 3 months, with 70% of eyes 20/20 or better. A significantly higher number of eyes had 0.75D or more of post-operative refractive astigmatism when the standard deviation of the pre-operative calculated corneal astigmatism angle, reported by the keratometer, was > 5 degrees.ConclusionsIn this single-site study investigating the use of the keratometry from the Lenstar LS 900® for toric IOL surgical planning, clinical outcomes appear equivalent to those reported in the literature for manual keratometry and somewhat better than has been reported for some previous automated instruments. A high standard deviation in the pre-operative calculated astigmatism angle, as reported by the keratometer, appears to increase the likelihood of higher post-operative refractive astigmatism.
Highlights
To establish clinical expectations when using the Lenstar LS 900W dual-zone automated keratometer for surgery planning of toric intraocular lenses
The conclusion from that study was that clinical results from surgical planning based on the Lenstar LS 900W were likely to be equivalent to those achieved using manual keratometry
Results with the Lenstar LS 900W are consistent with previous toric IOL studies in the literature, some of which used automated devices for keratometry readings
Summary
To establish clinical expectations when using the Lenstar LS 900W dual-zone automated keratometer for surgery planning of toric intraocular lenses. Methods: Fifty eyes were measured with the Lenstar LS 900W dual-zone automated keratometer. There is a high likelihood of a refractive result near plano for a majority of patients [2]. For those patients with significant corneal astigmatism, recent studies have demonstrated that implantation of a toric intraocular lens increased the likelihood of lower postoperative refractive astigmatism relative to a spherical monofocal IOL [3,4]. There are a number of factors that contribute to a successful clinical outcome with a toric intraocular lens. The ability to properly align the lens at the time of surgery is important, as is rotational stability after implantation [7,8]
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