- 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;
franco crick answered the question on January 29, 2018 at 10:06
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