Structure of the Eye and functions Flashcards
What is the tear layer?
The tear layer is the first layer of the eye that light strikes.
What is the function of the tear layer?
The function of the tear layer is to keep the eye smooth and moist.
What is the cornea?
The cornea is the front part of the eye that covers the iris, pupil and anterior chamber.
What is the function of the cornea?
The function of the cornea is to let light rays enter the eye and converge the light rays.
What is the Anterior chamber?
The Anterior chamber is where the Aqueous humour fills the space between the back surface of the cornea and from the surface of the vitreous, bathing the lens.
What is the function of Aqueous humour?
The function of the Aqueous humour is to nourish the cornea, iris and lens by carrying nutrients, removing waste products excreted from the lens, and maintaining intraocular pressure and thus maintaining the shape of the eye.
What is the Iris?
The Iris is the pigmented tissue lying behind the cornea that gives colour to the eye.
What is the function of the Iris?
The function of the Iris is to control the amount of light entering the eye by varying the size of the papillary opening.
What are the Lens and its function?
The Lens is the transparent, biconcave intraocular tissue that helps bring rays of light to focus on the retina.
(Natural lens of the eye).
What is Vitreous Humour and its function?
The Vitreous Humour is the transparent, colourless gelatinous mass that fills the rear two-thirds of the eyeball, between the lens and the retina.
What is the Retina and its function?
The retina is the light-sensitive nerve tissue in the eye that converts images from the eye’s optical system into electrical impulses, that are sent along the optic nerve to the brain, to interpret as vision.
What is the Sclera and its function?
The Sclera provides protection and form/shape.
What is the Optic nerve?
The Optic nerve is the largest sensory nerve of the eye.
What is the function of the Optic nerve?
The function of the Optic nerve is to transfer visual information from the retina to the vision centres of the brain via electrical impulses.
What is the Pupil?
The Pupil is the variable-sized black circular opening in the centre of the Iris.
