Corneal Astigmatism Measurement Study

This study has been completed.
Information provided by (Responsible Party):
Alcon Research Identifier:
First received: January 6, 2009
Last updated: April 6, 2012
Last verified: July 2009

To assess which commercially available measurement device is most accurate in measuring low (< 1.0 D) degrees of corneal astigmatism.


Study Type: Observational
Study Design: Time Perspective: Prospective

Further study details as provided by Alcon Research:

Primary Outcome Measures:
  • Measurement of corneal power [ Time Frame: Day 1 ] [ Designated as safety issue: No ]

Enrollment: 50
Study Start Date: December 2008
Study Completion Date: April 2009
Primary Completion Date: April 2009 (Final data collection date for primary outcome measure)
Measurement device


Ages Eligible for Study:   50 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population

community sample


Inclusion Criteria:

  • 50 years of age and older
  • Proof of eye exam within the last 3 months
  • Corneal astigmatism of <1.0 diopter

Exclusion Criteria:

  • Prior history of refractive or corneal surgery
  • Corneal trauma/disease
  • Intraocular surgery
  Contacts and Locations
Please refer to this study by its identifier: NCT00818532

United States, Texas
Alcon Call Center for Trial Locations
Fort Worth, Texas, United States, 76134
Sponsors and Collaborators
Alcon Research
  More Information

No publications provided

Responsible Party: Alcon Research Identifier: NCT00818532     History of Changes
Other Study ID Numbers: P-08-04
Study First Received: January 6, 2009
Last Updated: April 6, 2012
Health Authority: United States: Institutional Review Board

Keywords provided by Alcon Research:
Corneal astigmatism
Low diopter
Corneal measurement
Corneal astigmatism < 1 Diopter

Additional relevant MeSH terms:
Refractive Errors
Eye Diseases processed this record on April 17, 2014