Melanosis is a normal condition of the eye. It has no serious complications and it is not considered as a cause of damage to vision or loss of eyesight. Normally, melanin is secreted by melanocytes in the dermis layer which covers our skin. When we are exposed to strong sunlight for long periods, the cells start to produce higher levels of melanin. This creates darkening effect which may increase in color if we spend too much time under the sun. The second thing that causes ocular melanosis is aging where some changes are caused on your retina due to aging process and sunlight exposure.