What is a cataract?

A cataract is the opacity of the crystalline. The crystalline is the lens inside the eye, behind the iris and the pupil, and is transparent when we are born. It has an external capsule and an internal content composed by proteins arranged in a specific way, in order to obtain transparency.

Its function is the focusing of objects. It allows us to focus distant and near objects, through the change of its shape. The lens suffers several changes with aging that lead to cataract.
These changes are: loss of transparency of its content, first taking a yellowish colour, brownish at the end, and also loss of elasticity, as it becomes more and more rigid. This rigidity causes Presbyopia, which causes the inability to focus near objects.