Our eyes are the window to the world outside: they provide about 80% of the information about the environment that surrounds us. Taking care of them is essential for this reason alone. As a consequence, it is useful to understand how our eyes function and how we can prevent eye diseases, disorders and injuries. Useful recommendations on how to safeguard our sight are also essential. Finally, we also take a look at diagnostics and the new frontiers in ophthalmology around the world.