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Effects of Different Add Powers on the Comfort and Productivity of Computer Users With Fixed or Free Head Movement

This study has been completed.
Sponsor:
Information provided by:
American Optometric Association
ClinicalTrials.gov Identifier:
NCT00317525
First received: April 21, 2006
Last updated: September 7, 2006
Last verified: May 2005
History of Changes

April 21, 2006
September 7, 2006
May 2005
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  • Visual comfort
  • Productivity (correct words per hour)
Same as current
Complete list of historical versions of study NCT00317525 on ClinicalTrials.gov Archive Site
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Effects of Different Add Powers on the Comfort and Productivity of Computer Users With Fixed or Free Head Movement
Effects of Different Add Powers on the Comfort and Productivity of Computer Users With Fixed or Free Head Movement

The aim of this study is to examine the relationship between optical blur from poor refractive corrections (glasses) of older workers using computers and their productivity and comfort in the workplace. The investigators believe that improving the visual status of subjects who use computers will have a beneficial effect on productivity and visual comfort.

The aim of this study is to examine the relationship between optical blur from poor refractive corrections (glasses) of older workers using computers and their productivity and comfort in the workplace. We believe that improving the visual status of subjects who use computers will have a beneficial effect on productivity and visual comfort. All subjects will be required to complete a vision screening at no charge to decide if they qualify for the study. This is a double-blind study, which means that neither the subject nor the doctors will know which pair of lenses you will be wearing during the parts of the study. Subjects will complete a total of 4 hours of testing. The total amount of testing will be divided into ten 15-minute periods. During each period, the investigator will place different lenses in a trial frame. The trial frame that the subject will wear during the experiment will have their prescription for near plus an unknown pair of lenses. During the testing, the subject will complete a task involving finding and deleting apostrophes from a manuscript on a standard computer. Either the investigator or co-investigator will explain how to do this simple task. Subjects will answer a short survey before and after these tasks to check on symptoms resulting from using the computer. The following periodic measurements will be made during the study: productivity and accuracy to search for apostrophes (‘) in a document on one of the states of the U.S. These tasks will require a total of 4 hours testing with a total of ten pairs of trial lenses during a single visit.
Interventional
Phase 3
Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Factorial Assignment
Masking: Double-Blind
Primary Purpose: Treatment
  • Refractive Errors
  • Asthenopia
Device: Spectacle Lenses
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*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
36
June 2006
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Inclusion Criteria:

  • 40 years of age or greater
  • 20/40 visual acuity or better in each eye
  • Use a computer at least 1 hour per work day
Both
40 Years and older
Yes
Contact information is only displayed when the study is recruiting subjects
United States
 
NCT00317525
X050314015
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American Optometric Association
Not Provided
Principal Investigator: Kent M Daum, O.D., Ph.D. School of Optometry, University of Alabama at Birmingham
American Optometric Association
May 2005

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP