How is the mammalian eye adapted/ suited to its function?

a)Conjunctiva;
-It is a thin epithelium to protect the cornea,
-It is transparent to allow light pass through.
-It is glandular/ has goblet cells which secrete mucus for lubrication.
b)Sclerotic layer/sclera layer- It contains tough fibres/ inelastic collagen fibres/ it is fibrous to maintain the shape of the eyeball and protect inner parts of the eye/ eye ball.
c)Cornea.
-It is transparent to allow light pass through.
-It is curved to refract/ bend light rays onto the retina.
d)Choroid layer.
-It is rich in blood vessels/ highly vascularized/ has numerous capillaries to supply the retina/ eye with nutrients and oxygen (nourish the eye) and remove metabolic wastes.
-It has pigmented/ black cells to prevent reflection of light in the eye
e)Retina-
-It contains photoreceptors/ cones and rods to perceive light/ where the image is formed/ focused/ image formation.
-It has cones for colour vision, bright light vision, colour perception and rods for dim light vision.
f)Fovea centralis-Has numerous cones only for accurate vision/ visual acuity;
g)Blind spot- It lacks photoreceptors / cones and rods to allow passage of blood vessels and for exit of optic nerve;
h)Optic nerve-it has sensory neurons/ nerve cells that transmit impulse to the brain;
i)Lens.
-It is biconvex to refract/ focus light rays onto the retina;
-It is transparent to allow light pass through;
-It is elastic to allow adjustment of the shape of lens;
j)Ciliary body;
-It is made up of ciliary muscles that contract and relax/ are contractile to change the shape of the lens during accommodation;
-It is glandular/has secretory cells to produce/ secrete aqueous humour;
k)Suspensory ligaments; They are inelastic and hold the lens in position to the ciliary body;
l)Iris; This is the coloured part of the eye;
-It has radial and circular muscles to control the size of the pupil;
-It has melanin to absorb strong light and prevent blurred vision;
m)Pupil; This is an opening on the iris through which light passes into the eye;
n)Aqueous humour;
-It is jelly like which maintains the shape of the eye ball;
-It contains oxygen and nutrients for the cornea and the lens;
-It is transparent to allow light to pass through and refract it onto the retina;
o)Vitreous humour;
-It is jelly-like to maintain the shape of the eye ball.
-It is transparent to allow light to pass through and refract it onto the retina;