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Corneal Power, Astigmatism, and Aberration Changes After LASIK

NCT01893671 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 22

Last updated 2018-04-05

No results posted yet for this study

Summary

The primary goal of the study is to determine if Optical Coherence Tomography (OCT) measurement of corneal power and astigmatism is more accurate than conventional Placido-ring corneal topography. A second goal is to evaluate OCT-based epithelial thickness mapping. The postoperative epithelial thickness variation will be used to calculate refractive effects and calibrate the smoothing parameter in the mathematical model relating corneal mean curvature and epithelial thickness. A third goal is to assess the repeatability of OCT measurements. A fourth goal is to develop a method of estimating the focusing power, astigmatism, and HOA of the crystalline lens based on measurements of the lens' anterior and posterior capsular topographies and positions with the ultrahigh-speed MIT OCT prototype.

Conditions

  • Measurements of Patients Using OCT Before and After LASIK

Sponsors & Collaborators

  • National Eye Institute (NEI)

    collaborator NIH

  • Oregon Health and Science University

    lead OTHER

Principal Investigators

  • David Huang, MD, PhD · Oregon Health & Science Universtiy

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2011-01-31
Primary Completion
2017-08-31
Completion
2017-08-31

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01893671 on ClinicalTrials.gov