Oxygen deprivation causes tiny blood vessels to grow into the clear tissue of your cornea .
Your doctor uses this light to examine the cornea , iris, lens and anterior chamber of your eye.
The cornea is kept transparent by the continuous removal of fluid by the endothelial cells.
The iris is the colored part of the eye, which lies behind the transparent cornea .
The limbus is the thin area that connects the cornea and the sclera, the white part of the eye.
The colored circular membrane in the eye just behind the cornea is called the iris.
These rays of light first travel through the transparent cornea , and then through the lens, which helps to focus the light.
The whole eye is not used, only the cornea , the transparent front of the eye, and the sclera, the white part of the eye.
Your cornea is transparent, allowing light to pass through much like clear glass.
The top layer of the cornea is not damaged by the procedure, so there is unlikely to be any pain afterwards.