<qa>  What is the presence of any significant ocular disease that may compromise vision in the study eye3. Presence of any substantial ocular disease other than diabetic retinopathy or central retinal vein occlusion that may compromise vision in the study eye and or confound interpretation of the data; e.g. substantial cataracts, advanced glaucoma, optic neuritis, optic neuropathy or atrophy, marked macular atrophy, history of retinal detachment, uveitis, viral or other forms of chorioretinitis, etc. 