The eye is a spheroid structure around the size of a ping pong ball that functions to distinguish light, dark, shape, color, brightness and distance. It includes structures like the eyelids, conjunctiva, cornea, iris, pupil, lens, vitreous humor, retina, blood vessels and optic nerve. The retina contains light-sensitive photoreceptor cells called rods and cones that convert light into electrical signals to the brain where they are interpreted as vision.
2. Gift of the Creator
Gives us the sense of sight
70% of all sensory receptors are in the eye
Spheroid structure, about 2/3 the size of a
ping-pong ball
Functions: distinguishes light and dark,
shape, colour, brightness & distance of
objects.
3. Includes : bony orbit, eyelids, eyelashes,
tears and fat glands, extra ocular
muscles, conjunctiva
4. Most of the eye is enclosed in a bony orbit
Structure:
o Cheekbone
o Forehead
o Temple
o Side of nose
Function:
Provides protection to the eye
5. A thin fold of skin that covers the eye
Protect eye from foreign matter (dust, dirt, debris)
Protect against bright light that might damage the
eye
Lubricate the eye surface by distributing tears over
the cornea
Upper
eyelid
Lower eyelid
6. Are the hairs that grow
at the edge of eyelids
Protect the eye by
filtering out foreign
matter
7. A thin, clear layer of skin
Lines the inner surface of eyelids &
covers the front surface of the eye
ball except the cornea
Secretes mucus to lubricate the eye
Keeps bacteria and foreign
material from getting behind eye
8.
9. Innermost, sensitive layer of the eye
A delicate membrane containing
photoreceptors & associated
neurons
11. Sensitive to dim light
Present everywhere in the retina
except the fovea
Allow dim light vision & peripheral
vision
125 million rods in the average
retina
12. Sensitive to bright light
Clustered near the centre of
retina(fovea)
Distinguish colours & allow
sharp vision
5 million cones in the average
retina
22. A clear, watery fluid in the anterior
chamber
Nourishes the lens & cornea and helps
refract light onto the retina
23. A clear, gel-like fluid in the posterior
chamber
Supports the lens & retina and keeps
the eye from collapsing
Aids the magnifying power of the eye
24. Light rays coming from object enter
through the cornea, progress through
pupil & fall on eye lens which converts
light rays & produces a real & inverted
image of object on retina. The image
thus formed is conveyed to brain by optic
nerve in the form of electrical signals
which are seen by the brain as a visual
image.