Best toric outcomes
Dual zone keratometry for best axis and astigmatism measurement
LENSTAR's dual zone keratometry uses 32 measurement points on two rings with 1.65 and 2.3mm diameter to assess the corneal curvature of the patient. A recent study by Dr. Warren Hill et al. showed that axis and astigmatism measurement of the LENSTAR is equivalent to the "Gold Standard" manual keratometry, recommended for the use with toric IOL by leading IOL manufacturers.
In the video below, Dr. Kjell Gunnar Gundersen form Norway is sharing initial data with you on his clinical study; how LENSTAR improves his refractive outcomes with toric IOLs.
Dual zone keratometry for efficient toric IOL implantation
Dual zone keratometry with the LENSTAR provides the user with stable and accurate k-readings as well as measurement of the astigmatism and axis of the assessed eye. Using 32 measurement points, LENSTAR captures five times more data than standard automated keratometers, commonly using six measurement points only. The closely spaced marker pattern of the dual zone keratometry minimizes the need for interpolation, providing the user with accurate information on the axis location and amount of astigmatism, equivalent to the gold standard manual keratometry (Hill et al.).
I a recent study Dr. Kjell Gunnar Gundersen showed how LENSTAR improves the patient workflow and refractive outcomes in his toric patients. In the study only LENSTAR K readings were used to plane the toric IOL. The results may be summarized as follows:
- 89% of all eyes had best uncorrected visual acuity within one line of best corrected visual acuity
- mean rest cylinder was as low as 0.45D
- refractive outcomes: 96% <0.5D sphere; 65% <0.5D astigmatism
Please read Dr. Gundersen's conclusion of th study: "We found that 89% of eyes had uncorrected visual acuity within one line of best corrected visual acuity. And this really indicates that we have close to perfect postoperative refractive status!"
References:
- Simulation of toric intraocular lens results: Manual keratometry versus dual-zone automated keratometry from an integrated biometer.
Hill W, Osher R, Cooke D, Solomon K, Sandoval H, Salas-Cervantes R, Potvin R.
J Cataract Refract Surg. 2011 Dec;37(12):2181-7.
