2. T
• The human eye consist of photoreceptors known as photoreceptors that are
sensitive to light.
• Both animals and humans have 3D or stereoscopic vision, this means that their eyes.
• Each eye is able to view objects from different angles because visual fields overlap.
3. THE HUMAN EYE CONSIST OF THE
FOLLOWING PARTS
1.Outer layer of the eye
-The sclera( which is the white outer layer that has two important functions,
protecting and supporting the eyeball.)
-Transparent membrane that moisten the eye surface.
- The cornea( the transparent part of the eye that refracts light rays.
**The sclera, conjunctiva and cornea make up the outer layer of the eye.
4. 2.MIDDLE LAYER OF THE EYE
• -Pupil (The black hole in the eye that admits light into the eye.
• -Iris (is the coloured part of the eye that has two important functions viz, regulates
the size of the pupil and light entrance).
• Lens ( is the transparent biconvex structure of the eye that refracts and ensures that
light focuses on the retina.
5. 3.INNER LAYER
• Consist of the retina- which is made up of photoreceptors called cones and rods.
• Rods-provide overview sight (make black and white vision possible)
• Cones- provides colour vision.
• Blind spot- area where nerves and blood vessels enter and leave the eye. Provides
no vision.
• Fovea centralis-offers best image possible.
6. *CONES
• The cones are located in the fovea centralis, cones become less away from the fovea centralis.
• They are activated by bright light and allow us to detect fine detail and colour.
• Cones have three pigments namely Blue, Green and Red.
• Lack of certain cones causes color blindness.
7. *RODS
.Contain a deep visual pigment call rhodopsin.
They are sensitive to light and suited for night vision and peripheral vision.
. They are found on either side of the fovea and the further
Away from the fovea.
8.
9. THE EYE CONSIST OF TWO CAVITIES
• A. The anterior cavity:
-consists of watery aqueous humor which is produced by the ciliary body.
B. Posterior cavity:
-Is filled with jelly like vitreous humor.
10. • Reference list
• Designua (2019) “Shutterstock images”. Available from
https://www.shutterstock.com/image-vector/schematic-structure-rod-cell-
peripheral-vision-117137794. Accessed on 8-11-2019.
