We will look at the following parts:

CORNEA (clear lens in front of eye)

transparent covering of the front of the eye

Allows for the passage of light into the eye and functions as a fixed lens.

PARTS: Cornea (Il-xaydh)

Allows for the passage of light into the eye and it also focuses the light

FUNCTION of Cornea

Pupil size is controlled by iris muscles

PUPIL (black hole)

black hole in iriswhere light enters

PARTS: Pupil (Wiil)

Pupil and Iris

the hole where light enters into the eye

FUNCTION of Pupil

THE EYE: PUPILWhen the eye needs more light to enter (when it is dark), the pupils get larger; allowing more light to enter the eye

THE EYE: PUPILWhen the eye needs less light to enter (when it is very bright), the pupils get smaller; allowing less light to enter the eye

The iris is a colored, circular muscle

IRIS (colored part)

colored part of eye

controls light entering

PARTS: Iris (Kurux)

controls the amount of light entering the eye

FUNCTION of Iris

SCLERA – a tough white skin (made of tissue) that covers all of the eyeball except the cornea.

SCLERA(white part)

whites of the eye

supports eyeball

provides attachment for muscles

PARTS: Sclera

supports eyeball and provides attachment for muscles

FUNCTION of Sclera

LENS (lens behind pupil)

converging lensallows us to see objects

near and far

PARTS: Lens

allows us to see objects near and far

FUNCTION of Lens

RETINAinternal membranecontains light-

receptive cells (rods and cones)

converts light to electrical signals

PARTS: Retina

converts light waves to electrical signals

FUNCTION of Retina

OPTIC NERVETransmits electrical impulses

from retina to the brainBrain takes inverted image

and flips it so we can see

PARTS: Optic Nerve(Dareenwadka aragga

Transmits electrical signals from retina to the brain

FUNCTION of Optic Nerve

EYE LID

EYELASHES

CORNEA

LENSE

PUPIL

IRIS

SCLERA

RETINA

BLOOD VESSELS

OPTIC NERVE

Eye

Eye Parts Eye Parts

1 Cornea(Il-xaydh)Transparent window at the front of the eyeball

Allows for the passage of light into the eye and functions as a fixed lens.

2 Pupil black hole in iris

When the eye needs more light to enter (when it is dark), the pupils get larger; allowing more light to enter the eyeWhen the eye needs less light to enter (when it is very bright), the pupils get smaller; allowing less light to enter the eye

3 IrisThe iris is a coloured, circular muscle

.The hole where light inters into the eye.

4 SCLERA – a tough white skin (made of tissue) that covers all of the eyeball except the cornea.

whites of the eye supports eyeballprovides attachment for muscles

Eye Parts Functions5 LENS

(lens behind pupil) Allow us to see objects near and far

RETINAinternal membrane converts light waves to electrical signals

OPTIC NERVE Transmits electrical signals from retina to the brain

Long sightedness

HYPEROPIA• Far-sightedness• Problem seeing close

objects• Distance between lens

and retina too small• Light focused behind

retina• Corrected with

converging lenses

Far-Sighted (Hyperopia)

Short sightedness

MYOPIA• Near-sightedness• Problem seeing objects

far away• Distance between lens

and retina too large• Light focused in front of

retina• Correct with diverging

lenses

Near-Sighted (Myopia)

1.Which structure regulates the amount of light entering the eye?

A. CorneaB. RetinaC. LensD. Pupil2.Which part of the eye regulates the amount

of light entering the eye?A. IrisB. CorneaC. Lens

3. Which part of your changes its size to control entering light:

A. CorneaB. ScleraC. Pupil4. Which part of the eye carries impulses to brainD. Optic nerveE. RetinaF. PupilG. Lens

5.Which part of your eye contains light receptor cells:

A. PupilB. Retina C. Iris6.What is the most common way to fix

Nearsightedness or Farsightedness?D. Glasses and/or contactsE. Eye patchF. SurgeryG. Eye drop

7. A student is constantly squinting to read the blackboard. What is the most likely problem with their eyes?

A. cataractsB. ConjunctivitisC. FarsightednessD. Nearsightedness

1. What are the main structures of the human eye?

2. What are the functions of the iris and the pupil?