 3. Participant must have a positive diagnosis of MacTel Type 2 in at least one eye with evidence of fluorescein leakage typical of MacTel or at least one of the other features including loss of retinal transparencyhyper-reflectivity to blue light, crystalline deposits, right angle vessels, innerouter retinal low-reflective spaces, or hyperpigmentation not involving the center of the fovea, but no evidence of intraretinalsubretinal vascular proliferation; 