* Prospective phase 3 randomized study, double blind 12 weeks with paralel group of efficacy and security of Latanoprost 0.005% and Timolol 0.5 % in pediatric congenital glaucoma. Multicentric study. Pfizer,  2008 

* Clinical evaluation of the efficacy and tolerability of the fixed combination of timolol 0.5% and brinzolamida 0.2% in patients with ocular hypertension and primary open-angle glaucoma. Allergan, Mullticentric Study, 2007. 

* A randomized, 5 year postmarketing safety study of xalatan compared to “usual care” in patients with open angle glaucoma or ocular hypertension. Multicentric Study. Hospital Militar Central, July 1999 to July 2004.  

* Bleb needling after trabeculectomy. Multicentric Study con Latin American Society of Ophthalmology         ( SLAG). Militar Central, August - December 2002.  

* Xalatan vs Cosopt  Study. Multicentric Study. Latin American Society of Glaucoma (Sociedad Latinoamericana de Oftalmologìa). Hospital Militar Central. April to July, 2002.

* Ahmed valve with adjunctive mitomycin C in tenonectomized EYES. Multicentric Study with the Latin American Society of Ophthalmology. Hospital Militar Central. August 2000 - 2002. 

* Comparative Double masked Clinical trial between 0.12% DR 40001 eye drops and 0.5% Timolol maléate eyedrops in subjects with Chronic open angle glaucoma or ocular hypertension to compare efficacy and local ocular tolerance . Hospital Militar Central,  Bogota. April- Nov , 1997.