Brightstar Tution Centre

14/02/2022

15/05/2014

How is the human eye adapted to its function.
Conjunctiva is thin / transparent/ tough; to allow light to pass through/protect the eye;
Sclerotic layer is made up of (collagen) fibres/fibrous; it maintains shape of eyeball/protects the eye;
Cornea is transparent/curved; thus refracts light rays/ allows light to pass through;
Choroid (is a layer of a tissue) has black/dark pigments; prevent internal reflections of light in the eye;/Contains blood vessels; that supply oxygen / nutrients/ ( removes the metabolic) waste from the eye
Retina has rods / cones; for low vision / for colour/ bright light;
Yellow spot/Forea centralis/Fovea; has highest concentration of cones; for accurate/visual acuity;
Blind spot has no cones and rods; place where optic nerve leaves /enters the eye;
Optic nerve has sensory nerve fibres/ neurons; for transmission of impulse to the brain ( for interpretation)
Lens is biconvex / made up of elastic/transparent material; adjust to focus far or near objects/ allows light rays to pass through / for refraction of light rays;