An oily "lipid" layer, which reduces evaporation, stabilizes the lacrimal film and provides a high optical quality of its surface. Lipids are produced by meibomian glands.
Ichthyosis unites a group of disorders manifested by desquamation. In severe clinical course of ichthyosis, patients die due to the attachment of a common skin infection that can not be treated.
Megalocornea is defined as a condition in which the horizontal diameter of the cornea exceeds 13 mm and does not tend to further increase. Intraocular pressure is within the normal range
Gliomas (astrocytomas) can affect the anterior section of the optic pathway. It is also possible to develop gliomas in the orbit and the cranial cavity.