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Diabetic Retinopathy and Visual Function Study
This study has been completed.
Study NCT00001346   Information provided by National Institutes of Health Clinical Center (CC)
First Received: November 3, 1999   Last Updated: March 3, 2008   History of Changes

November 3, 1999
March 3, 2008
November 1992
 
 
 
Complete list of historical versions of study NCT00001346 on ClinicalTrials.gov Archive Site
 
 
 
Diabetic Retinopathy and Visual Function Study
Diabetic Retinopathy and Visual Function Study

The purpose of this study is to evaluate possible mechanisms of central visual loss in patients with diabetes mellitus. The visual loss of interest to be investigated is that associated with macular edema (prior to and following laser photocoagulation treatment) and that associated with panretinal photocoagulation. The evaluation will be performed with psychophysical testing, i.e., static perimetry and contrast sensitivity function. Of particular interest, the mechanisms of visual loss associated with macular edema (prior to and following laser photocoagulation) will be further investigated. Photoreceptor-mediated visual loss will be assessed by measurements of the Stiles-Crawford effect. Visual loss mediated by post-receptoral retinal changes will be assessed by measuring the Westheimer spatial desensitization/sensitization effect.

The purpose of this study is to evaluate possible mechanisms of central visual loss in patients with diabetes mellitus. The visual loss of interest to be investigated is that associated with macular edema (prior to and following laser photocoagulation treatment) and that associated with panretinal photocoagulation. The evaluation will be performed with psychophysical testing, i.e., static perimetry and contrast sensitivity function. Of particular interest, the mechanisms of visual loss associated with macular edema (prior to and following laser photocoagulation) will be further investigated. Photoreceptor-mediated visual loss will be assessed by measurements of the Stiles-Crawford effect. Visual loss mediated by post-receptoral retinal changes will be assessed by measuring the Westheimer spatial desensitization/sensitization effect.

 
Observational
 
  • Diabetic Retinopathy
  • Macular Degeneration
  • Vision, Subnormal
 
 

*   Includes publications given by the data provider as well as publications identified by National Clinical Trials Identifier (NCT ID) in Medline.
 
Completed
100
October 2000
 

Patients with diabetic retinopathy that has not been previously treated are eligible for the study.

Patients who have had laser photocoagulation (either focal or scatter) are not eligible.

Both
 
No
Contact information is only displayed when the study is recruiting subjects
United States
 
NCT00001346
 
930037, 93-EI-0037
National Eye Institute (NEI)
 
 
National Institutes of Health Clinical Center (CC)
February 2000

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