The Collaborative Initial Glaucoma Treatment Study (CIGTS), a National Eye Institute supported multicenter clinical trial, provided unique insights to how newly diagnosed open-angle glaucoma (OAG) should be treated, whether by initial surgical or medical intervention. Even so, much clinically-relevant and important information to glaucoma and its treatment remains to be evaluated in the extensive CIGTS data resource. Conduct of the proposed data analyses described in this grant application will provide unique, cost-effective opportunities to investigate additional research questions that are directly relevant to the management and care of patients who have open-angle glaucoma. We propose to conduct extensive analyses that address the following four specific aims: (1) Develop a predictive model that provides a ranking of factors that influence improvement in visual field (VF) during treatment of OAG. (2) Describe the natural history of open-angle glaucoma (OAG) development in initially un-treated fellow eyes, and develop a predictive model for the onset of OAG in such eyes. (3) Investigate VF defects documented in the CIGTS, including their location, cluster number, and extent at baseline, response to IOP reduction and elevation, and the association of baseline VF defect characteristics with the probability of progressive VF loss. (4) Compare alternate methods to define and analyze progressive loss of visual field - pointwise linear regression, mixed linear regression, "event-based" methods, and trajectory analysis - with regard to the outcomes they yield (risk factors, estimates of VF progression).

Public Health Relevance

The Collaborative Initial Glaucoma Treatment Study, a National Eye Institute supported multicenter clinical trial, provided unique insights to how newly diagnosed glaucoma should be treated, whether by initial surgical or medical intervention. Conduct of the proposed data analyses described in this grant application will expand our ability to provide evidence-based direction to the management and care of patients diagnosed with glaucoma. In addition, these analyses will inform future studies of how best to evaluate progression of visual field loss in glaucoma, which is the most important outcome to monitor in studies of glaucoma treatment.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21EY020912-02
Application #
8289417
Study Section
Special Emphasis Panel (ZEY1-VSN (02))
Program Officer
Everett, Donald F
Project Start
2011-07-01
Project End
2014-06-30
Budget Start
2012-07-01
Budget End
2014-06-30
Support Year
2
Fiscal Year
2012
Total Cost
$193,125
Indirect Cost
$68,125
Name
University of Michigan Ann Arbor
Department
Ophthalmology
Type
Schools of Medicine
DUNS #
073133571
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109
Gillespie, Brenda W; Musch, David C; Niziol, Leslie M et al. (2014) Estimating minimally important differences for two vision-specific quality of life measures. Invest Ophthalmol Vis Sci 55:4206-12
Musch, David C; Gillespie, Brenda W; Palmberg, Paul F et al. (2014) Visual field improvement in the collaborative initial glaucoma treatment study. Am J Ophthalmol 158:96-104.e2