Cyclotorsion: a possible cause of residual astigmatism in refractive surgery. Journal of Cataract and Refractive Surgery. Astigmatism management in cataract surgery with the AcrySof toric intraocular lens. Toric intraocular lens versus opposite clear corneal incisions to correct astigmatism in eyes having cataract surgery.
Mendicute J., Irigoyen C., Ruiz M., Illarramendi I., Ferrer-Blasco T., Montés-Micó R.
#ITRACE TORIC LENS ALIGNMENT ARCHIVE#
Graefe’s Archive for Clinical and Experimental Ophthalmology. Limbal relaxing incision during cataract extraction versus photoastigmatic keratectomy after cataract extraction in controlling pre-existing corneal astigmatism. Analysis of biometry and prevalence data for corneal astigmatism in 23 239 eyes.
#ITRACE TORIC LENS ALIGNMENT MANUAL#
It can eliminate the potential systematic errors resulting from varying head positions during the preoperative keratometry measurement and from manual marking. The TRP marking method using the iTrace aberrometer is simple and accurate for preoperative marking of toric IOLs. The mean toric IOL misalignment was lesser but without significance in the TRP marking group than in the SHM marking group after 3 postoperative months (2.66° ± 1.42° versus 3.29° ± 1.67° P=0.295). There was no statistically significant difference in BCVA, UDVA, preexisting corneal astigmatism, or residual astigmatism between the groups before or after surgery ( P > 0.05).
The follow-up duration was 3 months after cataract surgery.įifteen eyes of 15 patients were in the TRP marking group and 15 eyes of 15 patients in the SHM marking group. TRP marking involved marking three points randomly in the corneal limbus of the patients and accurately marking the horizontal meridian was not required.
All patients were prospectively randomized into the TRP marking group or slit-lamp horizontal meridian (SHM) marking group. Accurate toric lens alignment along the calculated meridian is also crucial to achieve effective astigmatism correction. Thirty eyes of 30 patients undergoing cataract surgery with coexisting corneal astigmatism of over 1.0 D were included in this study. Prospective, randomized comparative trial. Department of Ophthalmology, Guangdong Eye Institute, Guangdong Academy of Medical Sciences, Guangdong Provincial People's Hospital, Guangzhou, China. Objective To research and evaluate measuring Toric intraocular lens (Toric IOL) alignment by iTrace aberration without mydriasis.Methods Forty-five eyes of 35 patients underwent phacoemulsification in Tianjin Medical University Eye Hospital from June 2015 to February 2016 were enrolled.Follow-up and iTrace aberration examination were performed at postoperative 1 week.The internal optics aberration astigmatism axis was transformed into postoperative Toric IOL alignment.The result and the Toric IOL alignment measured by tradition slitlamp method were compared by linear correlation and difference.Results At postoperative 1 week,the uncorrected distant visual acuity and corrected distant visual acuity were (0.19 ± 0.12)LogMAR and (0.10 ☐.09) LogMAR.The UCVA was 20/40 or better in 42 eyes (93.3％).The mean IOL misalignment measured by slitlamp was (3.13 ± 2.86) degrees (ranged 0-9 degrees) and by the iTrace aberration was (4.44 ± 3.42) degrees(ranged 0-13 degrees),there was statistical significant difference (t =-2.321,P =0.025).The mean difference in the error of the Toric intraocular lens alignment measured by iTrace aberration and the slitlamp was (3.67 ± 3.59) degrees (ranged 0-14 degrees).The results showed that there was less than 5 degrees of difference between the two methods in 32 eyes (71.1％),locate 5 to 10 degrees in 9 eyes (20％),more than 10 degrees in 4 eyes (8.9％).The correlation between the 2 methods showed significant linear relationship (r =0.926,P ＜ 0.01).Conclusion Using iTrace aberration can accurately measure Toric intraocular lens alignment without mydriasis,the result has some reference value.To evaluate the clinical outcome of the three-random-point (TRP) marking method for toric intraocular lens (IOL) alignment using the iTrace aberrometer (Tracey Technologies Corp., Houston, TX).
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