EYES (Sense organs)

EYES
(Sense Organs)

Multiple Choice

What are the cells found in our sense organs that could detect stimuli?

• effector cells

• receptor cells

• motor neurones

• relay neurones

Multiple Choice

What is the bundle of sensory neurones inside the eyeball that carry visual impulses to the brain?

• facial nerve

• olfactory nerve

• optic nerve

• trigeminal nerve

Fill in the Blanks

What is the tough white outer layer of the eyeball?

Fill in the Blanks

What is the light-sensitive layer of tissue at the back of the eyeball? It also converts images to electric signals and sends them along the optic nerve to the brain.

​Let's check your blind spot.

​Let's check your blind spot.

Why do you think we
have a blind spot?

Multiple Choice

When looking directly at an object, its image falls upon the portion of the retina called the...

• choroid

• fovea

• lens

• sclera

FOVEA means tiny pit in Greek.
It is the point where visual acuity
(sharpest vision) is at its highest.

Multiple Select

The two photoreceptors (detect and respond to light) in the retina are called...

• ciliary body

• cons

• rods

• suspensory ligaments

RODS vs CONES

RODS vs CONES

low light vision
(night/ dark)

higher light
(day/ bright)

COLOR
BLINDNESS
(many, few, none)

COLOR
BLINDNESS
Let's check!

Multiple Choice

No cones and rods are found in the blind spot

• true

• false

Multiple Select

What are true about cones?

• high resolution

• low resolution

• highest concetration in fovea

• lowest concetration in fovea

• colored vision

Multiple Choice

Which front section of the eye is curved, transparent with no blood vessels? It bends light to focus it at the back of the light (REFRACTION)?

• cornea

• iris

• lens

• pupil

CORNEA

CORNEA

CORNEA

Multiple Choice

What is the dark hole in the middle of the eye where light can enter and get into the main part of the eyeball?

• cornea

• iris

• lens

• pupil

PUPIL AND IRIS

IRIS REFLEX

IRIS REFLEX

Fill in the Blanks

The circular and radial muscles of the iris act in opposite way. Hence, they are pair of

muscles.

Fill in the Blanks

What is the clear, elliptical structure that sits behind the iris which sharpens the focus as it curvature changes?

HOW DO WE SEE THINGS?

AQUEOUS AND VITREOUS HUMOUR