Eyes

PARTS OF THE EYE

CORNEA

The

CLEAR TISSUE
that covers the

FRONT

of the eye.

PUPIL

The pupil is the

OPENING

through which
light ENTERS

the eye.

PUPIL

IN BRIGHT LIGHT:

the pupil becomes SMALLER.

IN DIM LIGHT:

the pupil becomes LARGER.

IRIS

● The circular structure

that surrounds the pupil

● Regulates the size of the

pupil.

● Contains pigments that

give eyes their color

Poll

CLASS POLL:

What color is your Iris?

• BLUE

• BROWN

• GREEN

• HAZEL

RETINA

A LAYER of

cells that lines

the BACK of

the eye.

RETINA

The retina contains
about 130 million
cells called rods
and cones that
respond to light.

LENS

A FLEXIBLE
structure that

FOCUSES

light.

HOW LIGHT IS FOCUSED:

The lens of your eye functions something like the lens of a
camera, which focuses light on photographic film.

Because of the way in which the lens of the eye bends the
light rays,

the image it produces is upside down and reversed.

HOW YOU SEE AN IMAGE:

Rays of light enter the eye and strike the cornea.

The light passes through a chamber filled with a liquid that
nourishes the eye.

It reaches the pupil.

The size of the pupils adjusts based on the amount of light entering the eye.

Light passes THROUGH the pupil and strikes the lens.

Muscles attached to the LENS adjust its’ shape, producing an image that is in focus.

After passing through the lens, focused light rays pass
through a clear, jellylike fluid and strike the retina.

When light strikes the rods and cones, nerve impulses travel
through the optic nerves to the brain.

One optic nerve carries impulses from the left eye and the
other from the right eye.

In the cerebrum, the brain combines the information from
each eye to produce a single image and turns the flipped
image right-side up.

HOW YOU SEE AN IMAGE:

After passing through the lens, focused light rays pass
through a clear, jellylike fluid and strike the retina.

When light strikes the rods and cones, nerve impulses travel
through the optic nerves to the brain.

HOW YOU SEE AN IMAGE:

One optic nerve carries impulses from the left eye and the
other from the right eye.

In the cerebrum, the brain combines the information from
each eye to produce a single image and turns the flipped
image right-side up.

Labelling

Label the parts of the eye:

Drag labels to their correct position on the image

IRIS

PUPIL

Labelling

Label the parts of the eye:

Drag labels to their correct position on the image

RETINA

OPTIC NERVE

PUPIL

CORNEA

LENS

Reorder

What is the pathway of light to the brain? Light travels:

• through the cornea

• through the pupil

• through the lens

• through the retina

• to the brain

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Poll

CLASS POLL:

Are you near sighted or farsighted?

• NEARSIGHTED

• FARSIGHTED

• I DON'T KNOW

• NEITHER

VISION PROBLEMS

NEARSIGHTEDNESS:

Can see nearby objects clearly,

but not faraway objects

Caused by an elongated eyeball

VISION PROBLEMS

FARSIGHTEDNESS:

Can see faraway objects clearly,
but not nearby objects appear

blurry.

Caused by a eyeball

that is shorter than normal.

Categorize

Options (6)

Organize these options into the right categories

NEARSIGHTED

FARSIGHTED

NEARSIGHTED EYEBALL

FARSIGHTED EYEBALL

Multiple Choice

Which eye is in the darker room?

Multiple Choice

Which eye is in the brighter room?

VISION PROBLEMS

COLOR BLINDNESS:

Inability to detect one or more colors.

Caused by deficiency in one or more sets of cones at birth.

Usually inherited.

VISION PROBLEMS

NIGHT BLINDNESS:

Inability to see well in dim light

Caused by poorly functioning rods.

Can be inherited or caused by a lack of Vitamin A.

Match

Match the VISION PROBLEM with it's EFFECT:

• Nearsightedness

• Farsightedness

• Astigmatism

• Color Blindness

• Night Blindness

Sees nearby objects clearly

Sees faraway objects clearly

Blurry or distorted vision

Inability to detect certain colors

Inability to see well in dim light

• Sees nearby objects clearly

• Sees faraway objects clearly

• Blurry or distorted vision

• Inability to detect certain colors

• Inability to see well in dim light

Match

Match the VISION PROBLEM with it's CAUSE:

• Nearsightedness

• Farsightedness

• Astigmatism

• Color Blindness

• Night Blindness

Elongated Eyeball

Shortened Eyeball

Uneven curvature in the cornea or lens

A deficiency in one or more set of cones

Poorly functioning rods

• Elongated Eyeball

• Shortened Eyeball

• Uneven curvature in the cornea or lens

• A deficiency in one or more set of cones

• Poorly functioning rods

Caring for Your Eyes

● To protect your eyes

from damage wear
protective goggles when
you work with harmful
substances or around
machinery.

● Get regular eye exams

to help you prevent or
identify vision
problems, eye diseases
and eye infections.

Caring for Your Eyes

OPTOMETRIST:

A professional who
provides eye and
vision care, checks
you for vision
problems.

Caring for Your Eyes

● Wear sunglasses

that provide UV
protection.

Caring for Your Eyes