Diabetic Retinopathy and Visual Function Study
Data Collection
Cardiovascular Diseases+16
+ Diabetes Mellitus
+ Diabetic Angiopathies
Summary
Study start date: November 1, 1992
Actual date on which the first participant was enrolled.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.
Protocol
This section provides details of the study plan, including how the study is designed and what the study is measuring.100 patients to be enrolled
Total number of participants that the clinical trial aims to recruit.Eligibility
Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.Any sex
Biological sex of participants that are eligible to enroll.Healthy volunteers not allowed
If individuals who are healthy and do not have the condition being studied can participate.Conditions
Pathology
Criteria
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.
Study Centers
These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.This study has 1 location