“…Drug delivery systems using NPs have been developed in recent decades to solve the major problems of ocular drug administration, resulting in a safe and effective system that delivers the medicine to the appropriate region (Qamar et al, 2019). Development of various nanotechnology-based nanomedicines with different novel systems, including liposomes (Urquhart and Eriksen, 2019), solid lipid NPs (Patil et al, 2019), nanostructured lipid carriers (NLA) (Ozdemir et al, 2019), dendrimers (Villanueva et al, 2016), polymeric NPs (Mandal et al, 2017), inorganic NPs, microemulsion, nanosuspension, nanoemulsion, and noisome, which results in increased retention time, the solubility of hydrophobic drugs, bioavailability, enhanced drug penetration, and target specific sites. The encapsulation of the desired medicine in a nanoparticle also helps to protect it from degradation (Qamar et al, 2019).…”