Editor,—Latanoprost 0.005% is a prostaglandin analogue that causes reduction of the intraocular pressure (IOP) by increasing the uveoscleral outflow of aqueous humour through the ciliary muscle region to the suprachoroidal space and the episcleral veins.12 Initial studies on latanoprost demonstrated reductions of 20% to 40% in the IOP of normotensive volunteers, patients with ocular hypertension, and glaucoma patients.3-10 The efficacy of latanoprost 0.005% in lowering the intraocular pressure (IOP) in different glaucoma populations, especially when added to anti-glaucoma medications already being used, …