Comparisons of the Astigmatic Power of Toric Intraocular Lens Using Three Toric Calculators: AcrySof, TECNIS, and iTrace Toric Calculator

Sponsor

Yonsei University (Other)

Overall Status

Completed

CT.gov ID

NCT01978106

Collaborator

(none)

100

Enrollment

Location

Duration (Months)

33.8

Patients Per Site Per Month

Study Details

Study Description

Brief Summary

Purpose of this study is to compare the astigmatic power of the toric IOL obtained from the AcrySof toric calculator, TECNIS toric calculator, and iTrace toric calculator in a group of patients with preoperative with-the-rule (WTR) and against-the-rule (ATR) corneal astigmatism. The study included 100 eyes with cataract and greater than 0.75 diopter of corneal astigmatism, and the subjects were divided into WTR and ATR group. Keratometric value was measured using autokeratometry, IOLMaster partial coherence interferometry (PCI), iTrace incorporating corneal topography and ray-tracing aberrometry. Based on measured values, toric IOL power calculations were performed using AcrySof, TECNIS and iTrace toric calculators.

Condition or Disease	Intervention/Treatment	Phase
Cataract Astigmatism

Study Design

Study Type:

Observational

Actual Enrollment :

100 participants

Observational Model:

Cohort

Time Perspective:

Retrospective

Study Start Date :

Jan 1, 2013

Actual Primary Completion Date :

Apr 1, 2013

Actual Study Completion Date :

Apr 1, 2013

Arms and Interventions

Arm	Intervention/Treatment
a WTR corneal astigmatism group Corneal astigmatism was defined as WTR when the steep corneal cylinder axis was within 30 degrees of the horizontal axis.
an ATR corneal astigmatism group Corneal astigmatism was defined as ATR when the cylinder axis was within 30 degrees of the vertical axis.

Outcome Measures

Primary Outcome Measures

Difference of toric intraocular lens power between three toric calculators [Immediately after measurement]
Comparison of the toric intraocular lens power calculated from Acrysof and TECNIS toric calculators using keratometric values measured by autokeratometry or IOLMaster PCI and that from iTrace toric calculator with keratometric value measurement using iTrace ray tracing wavefront aberrometry and iTrace simulated keratometry.

Eligibility Criteria

Criteria

Ages Eligible for Study:

33 Years to 87 Years

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Yes

Inclusion Criteria:

Subjects who planned to undergo cataract removal by phacoemulsification
Subjects with preoperative corneal astigmatism greater than 0.75 D, as determined by autokeratometry

Exclusion Criteria:

Subjects with more than 2.74 D of corneal keratometric value from autokeratometry
a history of intraocular or corneal surgery and ocular trauma
biomicroscopic evidence of corneal disease that could affect corneal astigmatisms
contact lens wearer