Aim 1: To establish the synergistic effect of local ophthalmic NSIADs and systemic caffeine as optimal therapies for the attenuation and/or prevention of severe ROP. Hypothesis: Ocular Ketorolac or systemic Ibuprofen potentiated with systemic Caffeine will prevent or diminish the severity of ROP. We will: a) Evaluate the safety, tolerability, and efficacy of early postnatal local ophthalmic NSIADs for prevention of severe ROP in ELGANs. b) Determine the pharmacokinetics, pharmacodymanics and pharmacogenomics of NSAIDs potentiated with caffeine for prevention of ROP.