Randomized, double-masked trial designed to investigate the use of TLC399 (ProDex) in subjects with macular edema due to CRVO or BRVO.

Part 1 is a randomized, double-maskedtrial trial designed to investigate the use of TLC399 in subjects with macular edema due to CRVO or BRVO. Three different dose strengths will be evaluated.

Part 2 is a randomized, double-masked study designed to evaluate 2 doses of TLC399 in subjects with macular edema due to CRVO or BRVO. Subjects will be randomized 1:1 to receive two different dose strenghs of investigational product.

Inclusion Criteria:

1. male or female, at least 18 years of age
2. macular edema due to CRVO or BRVO
3. best-corrected visual acuity (BCVA) score of 20/40 to 20/400
4. mean central subfield thickness (CST) ≥350 um
5. willing and able to comply with the study procedure and sign a written informed consent
6. agree to use a medically acceptable form of birth control

Exclusion Criteria:

1. poorly controlled diabetes
2. history of significant intraocular pressure (IOP) elevation to steroid treatment
3. history of ocular hypertension and glaucoma
4. cataract surgery in the study eye within 3 months, or intraocular surgery within 6 months prior to screening
5. use of hemodilution for the treatment of RVO
6. use of IVT ranibizumab or bevacizumab in the study eye within 6 weeks prior to screening; or IVT aflibercept within 8 weeks prior to screening
7. IVT Ozurdex to the study eye within 6 months prior to screening
8. prior use of Retisert or Iluvien
9. use of systemic steroids or heparin within 1 month prior to screening