Evaluation of Position-induced Cyclorotation Between Wavefront Measurement and Refractive Surgery by the Iris Registration Method

July 21, 2009 updated by: National Taiwan University Hospital
Cyclorotation of eyes may be affected by motion and orientation of the head and body. An automated alignment method with the technique of iris recognition was used to assess the amount and orientation of position-induced cyclorotation between preoperative wavefront measurement and laser refractive surgery.

Study Overview

Status

Completed

Conditions

Detailed Description

Ninety-three consecutive patients undergoing bilateral wavefront-guided laser refractive surgery in the Department of Ophthalmology of the National Taiwan University Hospital between September 2004 and December 2007 were enrolled in this retrospective study. Before laser refractive surgery, all patients were seated in front of the Zyoptix 100 system platform (Bausch & Lomb, salt lake city, UT, USA) and received Zywave aberrometer measurement on both eyes. When patients were in the supine position for refractive surgery, an infrared camera mounted on the laser system (Technolas 217z100 excimer laser system, Bausch & Lomb)obtained iris images on undilated pupils before laser ablation. Overall cyclorotation was detected by a comparison between iris images of undilated pupils in the supine position and dilated pupils in the seated position before laser treatment. The degree and direction of position-induced cyclorotation were assessed.

Study Type

Observational

Enrollment (Actual)

93

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Taiwan
      • Taipei, Taiwan
        • Department of Ophthalmology, National Taiwan University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Ninety-three consecutive patients undergoing bilateral wavefront-guided laser refractive surgery in the Department of Ophthalmology of the National Taiwan University Hospital between September 2004 and December 2007.

Description

Inclusion Criteria:

  • patients undergoing bilateral wavefront-guided laser refractive surgery

Exclusion Criteria:

  • patients with strabismus, extraocular muscle palsy, muscle restriction or other diseases interfering normal ocular movement.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Cohort
  • Time Perspectives: Retrospective

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Taiwan University Hospital

Investigators

  • Study Director: Yu-Chih Hou, MD, Telephone: 886-2-23123456 Ext. 65025 Email: ychou51@ntu.edu.tw

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2008

Primary Completion (Actual)

June 1, 2008

Study Completion (Actual)

October 1, 2008

Study Registration Dates

First Submitted

July 21, 2009

First Submitted That Met QC Criteria

July 21, 2009

First Posted (Estimate)

July 22, 2009

Study Record Updates

Last Update Posted (Estimate)

July 22, 2009

Last Update Submitted That Met QC Criteria

July 21, 2009

Last Verified

July 1, 2009

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • 200906095R

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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