Eye is the most unique organ, delivery of drugs to the eye needs utmost care and it is a tedious process. There are so many conventional dosage forms like eye drops, suspensions ointments solutions lotions, possess less bioavailability due to lachrymal drainage. Drug administration to eye through the topical and intravitreal routes has many obstacles. Recently various drug delivery systems have been developed to improve the ocular bioavailability. These drug delivery systems increase the contact time as well as decrease the drug elimination. This review article focuses on the anatomy of the eye, various routes and barriers of drug delivery systems, conventional dosage forms and novel dosage forms.
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