Diabetic Retinopathy and Visual Function Study - Tabular View

Tracking Information
First Received Date ^ICMJE	November 3, 1999
Last Updated Date	March 3, 2008
Start Date ^ICMJE	November 1992
Primary Completion Date
Current Primary Outcome Measures ^ICMJE
Original Primary Outcome Measures ^ICMJE
Change History	Complete list of historical versions of study NCT00001346 on ClinicalTrials.gov Archive Site
Current Secondary Outcome Measures ^ICMJE
Original Secondary Outcome Measures ^ICMJE

Descriptive Information
Brief Title ^ICMJE	Diabetic Retinopathy and Visual Function Study
Official Title ^ICMJE	Diabetic Retinopathy and Visual Function Study
Brief Summary	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.
Detailed Description	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.
Study Phase
Study Type ^ICMJE	Observational
Study Design ^ICMJE
Condition ^ICMJE	Diabetic Retinopathy Macular Degeneration Vision, Subnormal
Intervention ^ICMJE
Study Arms / Comparison Groups
Publications *	Higgins KE, Meyers SM, Jaffe MJ, Roy MS, de Monasterio FM. Temporary loss of foveal contrast sensitivity associated with panretinal photocoagulation. Arch Ophthalmol. 1986 Jul;104(7):997-1003. Klein R, Klein BE, Moss SE, Davis MD, DeMets DL. The Wisconsin epidemiologic study of diabetic retinopathy. II. Prevalence and risk of diabetic retinopathy when age at diagnosis is less than 30 years. Arch Ophthalmol. 1984 Apr;102(4):520-6. Klein R, Klein BE, Moss SE, Davis MD, DeMets DL. The Wisconsin epidemiologic study of diabetic retinopathy. III. Prevalence and risk of diabetic retinopathy when age at diagnosis is 30 or more years. Arch Ophthalmol. 1984 Apr;102(4):527-32.
* Includes publications given by the data provider as well as publications identified by National Clinical Trials Identifier (NCT ID) in Medline.

Recruitment Information
Recruitment Status ^ICMJE	Completed
Enrollment ^ICMJE	100
Completion Date	October 2000
Primary Completion Date
Eligibility Criteria ^ICMJE	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.
Gender	Both
Ages
Accepts Healthy Volunteers	No
Contacts ^ICMJE	Contact information is only displayed when the study is recruiting subjects
Location Countries ^ICMJE	United States

Administrative Information
NCT ID ^ICMJE	NCT00001346
Responsible Party
Study ID Numbers ^ICMJE	930037, 93-EI-0037
Study Sponsor ^ICMJE	National Eye Institute (NEI)
Collaborators ^ICMJE
Investigators ^ICMJE
Information Provided By	National Institutes of Health Clinical Center (CC)
Verification Date	February 2000
^ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP