Nanoparticles have immense potential as a drug delivery carrier. At BME, BUET we have successfully developed nanoparticles from different polymers, such as chitosan, sodium alginate. The nanoparticles showed excellent biocompatibility, biodegradability and bioadhesion, properties. The sustained drug delivery and mucoadhesive characteristics of nanoparticles make them better candidates for ocular medication delivery. High drug entrapment efficiency indicates the potential for less drug waste and a smaller drug requirement.