**Noble Metals and Soft Bio-Inspired Nanoparticles in Retinal Diseases Treatment: A Perspective**

**Valeria De Matteis 1,\* and Loris Rizzello 2,3,4**


Received: 31 January 2020; Accepted: 8 March 2020; Published: 10 March 2020

**Abstract:** We are witnessing an exponential increase in the use of different nanomaterials in a plethora of biomedical fields. We are all aware of how nanoparticles (NPs) have influenced and revolutionized the way we supply drugs or how to use them as therapeutic agents thanks to their tunable physico-chemical properties. However, there is still a niche of applications where NP have not ye<sup>t</sup> been widely explored. This is the field of ocular delivery and NP-based therapy, which characterizes the topic of the current review. In particular, many efforts are being made to develop nanosystems capable of reaching deeper sections of the eye such as the retina. Particular attention will be given here to noble metal (gold and silver), and to polymeric nanoparticles, systems consisting of lipid bilayers such as liposomes or vesicles based on nonionic surfactant. We will report here the most relevant literature on the use of different types of NPs for an efficient delivery of drugs and bio-macromolecules to the eyes or as active therapeutic tools.

**Keywords:** retinal diseases; noble metals NPs; bio-inspired NPs; drug delivery
