aquaous humor
is a watery fluid which helps maintain the shape of the eyeball and provides nutrients and oxygen to the eye as well as taking away waste.
cornea
a curved transparent convex shaped covering which protects the eye and helps focus light rays into the retina at the back of the eye.
pupil
less of a structure and is more a hole / opening to the iris that helps control the amount of light entering the eye.
iris
a ring of muscles which change the shape of the pupil, adjusting the the amount of light entering the eye. the light enters the eye through the pupil and then sends it to the lens.
lens
a transparent, flexible, structure located imminently behind the pupil. The lens plays a major role in focusing light onto the retina. in order to focus light the lens adjusts according to the distance of the object being viewed. The lens is changed by the ciliary muscles attached to each end of the lens.
retina
receives and absorbs light, and also processes images. It consists of several layers of nerve tissue and light sensitive visual receptors called photoreceptors.
blind spot
the area of the brain where the optic nerve connects to the retina and blood vessels enter and exit. There are no photoreceptors there so light cannot be detected. this means that any part of the visual image focused on this spot will not be visually processed and we will remain blind to it.