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

NCT01978106 | Completed

• 1 other identifier: 1-2013-0041
• Study Type: observational
• Target: 100
• Locations: 1 country
• Sites: 1

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.

Conditions

Cataract; Astigmatism

Keywords

toric calculator; toric intraocular lens power; Acrysof; Tecnis; iTrace

Outcome Measures

Primary Outcomes (1)

• Difference of toric intraocular lens power between three toric calculators

  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.

  Immediately after measurement

Study Arms (2)

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.

Eligibility Criteria

• Age: 33 Years - 87 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Probability Sample

Study Population

Subjects who planned to undergo cataract removal by phacoemulsification between January 2013 to April 2013 at the Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea were included in this study.

You may qualify if:

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

You may not qualify if:

• 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

Sponsors & Collaborators

• Yonsei University: lead

Study Sites (1)

Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine

Seoul, 120-752, South Korea

Location

MeSH Terms

Conditions

Cataract; Astigmatism

Condition Hierarchy (Ancestors)

Lens Diseases; Eye Diseases; Refractive Errors

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: RETROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: October 31, 2013
• First Posted: November 7, 2013
• Study Start: January 1, 2013
• Primary Completion: April 1, 2013
• Study Completion: April 1, 2013
• Last Updated: November 7, 2013

Record last verified: 2013-11

Locations

KR (1)