- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00000131
Central Vein Occlusion Study (CVOS)
To determine whether photocoagulation therapy can help prevent iris neovascularization in eyes with central vein occlusion (CVO) and evidence of ischemic retina.
To assess whether grid-pattern photocoagulation therapy will reduce loss of central visual acuity due to macular edema secondary to CVO.
To develop new data describing the course and prognosis for eyes with CVO.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Central vein occlusion is a common retinal vascular disorder with potentially blinding complications. The two major complications are reduced central vision caused by macular edema and neovascular glaucoma caused by iris neovascularization. Other clinical trials have shown that laser photocoagulation is an effective treatment for complications found in diabetic retinopathy and branch vein occlusion, which have some features in common with CVO: neovascularization and reduced visual acuity caused by macular edema occur in all three disorders. Evidence from small-scale studies suggests that a grid pattern of photocoagulation reduces macular edema in CVO patients, although the associated changes in visual acuity are variable. The CVOS is a detailed investigation of grid pattern photocoagulation in a larger randomized group of patients.
Eligible patients were divided into four groups:
Group N: Eyes with extensive retinal ischemia (at least 10 disc areas of nonperfusion) were randomly assigned to receive panretinal photocoagulation or nontreatment unless iris neovascularization developed.
Group M: Eyes with visual loss ascribable to macular edema were randomly assigned to receive grid-pattern photocoagulation or nontreatment.
Group P: Eyes with relatively perfused retinas were followed to provide information about the natural history of the disease.
Group I: Indeterminate eyes in which the retina could not be visualized accurately because of hemorrhage were followed in a natural history study.
Green argon laser with a slit lamp delivery system was used for all treatments. Photographic documentation of retinal changes was obtained at entry, post-treatment, and at specified followup visits for a period of at least 3 years. The frequency of followup visits varied according to the group to which the CVO patient was assigned. Visual acuity, the primary outcome factor in the group with macular edema, was measured according to a modified Early Treatment Diabetic Retinopathy Study protocol at each visit.
Study Type
Phase
- Phase 3
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
Collaborators and Investigators
Sponsor
Publications and helpful links
General Publications
- A randomized clinical trial of early panretinal photocoagulation for ischemic central vein occlusion. The Central Vein Occlusion Study Group N report. Ophthalmology. 1995 Oct;102(10):1434-44.
- Natural history and clinical management of central retinal vein occlusion. The Central Vein Occlusion Study Group. Arch Ophthalmol. 1997 Apr;115(4):486-91. doi: 10.1001/archopht.1997.01100150488006. Erratum In: Arch Ophthalmol 1997 Oct;115(10):1275.
- Evaluation of grid pattern photocoagulation for macular edema in central vein occlusion. The Central Vein Occlusion Study Group M report. Ophthalmology. 1995 Oct;102(10):1425-33. doi: 10.1016/s0161-6420(95)30849-4.
- Baseline and early natural history report. The Central Vein Occlusion Study. Arch Ophthalmol. 1993 Aug;111(8):1087-95. doi: 10.1001/archopht.1993.01090080083022.
- Clarkson JG. Central Vein Occlusion Study: photographic protocol and early natural history. Trans Am Ophthalmol Soc. 1994;92:203-13; discussion 213-5. No abstract available.
Study record dates
Study Major Dates
Study Start
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- NEI-30
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