In the recent years considerable attention has been focused on the development of new drug delivery systems. Recently, several new techniques for drug delivery are made which are capable of controlling the rate of drug delivery, sustaining the duration of therapeutic activity or targeting the delivery of the drug to a tissue. A basic concept in ophthalmic research and development is that the therapeutic efficacy of an ophthalmic drug can be greatly improved by prolonging its contact with the corneal surface. Ocular drugs and delivery systems are currently undergoing a process of design optimization due to inherent physiological and anatomical constraint of the eye leading to limited absorption of topically applied drugs. Eye being a most delicate organ, ocular drug delivery is a challenge for the formulator. Novel trend in ocular research is to formulate a dosage form which not only prolongs the residence of system in eye but also helps to reduce the elimination of the drug and side effects. This book describes design, development and evaluation of such novel vesicular system for sustained ocular delivery of antiglaucoma drug.