I wear eye glasses. i feel that plastic glasses are a little blurry as compared to glass. is it so?

Slight possibility: Although glass lenses offer a subtle advantage in clarity over high index or polycarbonate lenses, typically the advantages of plastic far outweigh glass. Polycarbonate essentially can function as 'safety ' glasses. The drawback however is that plastic tends to scratch more easily no matter what over glasses. Again though, the functionality of plastic is superior.