Human Eye

Question 1

State the outer, middle and inner layer of the eye

Answer 1

Outer: Cornea
Middle: Pupil and Iris
Inner: Lens

Question 2

Give points about the location of the eye

Answer 2

-Within the depression in the skull (orbit/socket)
-Eyeball is attached to the orbit by 6 rectus muscles to move it within the orbit

Question 3

Define conjunctiva

Answer 3

A thin, transparent membrane covering eyeball from being exposed, it is a thin and continuous layer with the skin of the eyelids

Question 4

What is the Eyelid?

Answer 4

-It protects the eyeball
-Controls the amount of light entering the eye
-Wipes out the dust particles
-Spreads tears through the eye and prevents drying up

Question 5

What balances the formation of images?

Answer 5

Brain & Retina

Question 6

Whats the main component to see?

Answer 6

Light

Question 7

Light falling on an object is…

Answer 7

…reflected and some of it is refracted

Question 8

State the journey of light going through the eye

Answer 8

Refraction > Cornea > Aqueous Humor > Lens > Retina

Question 9

How does the image on the retina activate/stimulate rods or cones?

Answer 9

Image on the retina activates or stimulates either rods or cones depending on the intensity of light

Question 10

Image formed on the retina will be…

Answer 10

-Upside down (Inverted)
-Back to front (Reversed)
-Smaller in size then the object observed (Diminished)
-Rods and Cones > Optic nerve > Cerebrum > Right way up and right size > Retina

Question 11

What’s the meaning of ‘focusing?

Answer 11

Adjustment of lens in the right way is called focusing so that clear images of objects at different distances are formed on the retina