B1.6 The Eye

Question 1

Describe binocular vision

Answer 1

• both eyes facing forward
• both eyes focused on same thing
• allows to focus well and to judge distance correctly
• predators
• not a wide field of wiew

Question 2

Describe monocular vision?

Answer 2

• animals with an eye of each side of the head
• much wider field of view
• can see all around and see predatora
• cannot judge distance very well

Question 3

How do we judge distance?

Answer 3

Your brain compares the image from each eye. If images are very similar, the brain knows you are lookign at something from a distance

Question 4

What is accomodation?

Answer 4

Lens change shape, according to focus om near or distant objects

Question 5

Ring of ciliary muscle, accomodation for close and distant view?

Answer 5

Close- contracted

Distance- relaxed

Question 6

Suspensory ligaments- accomodation for close and distant view?

Answer 6

Close- slacken

Distant- become taut

Question 7

Lens- accomodation for close and distant view?

Answer 7

Close- rounded, fat shape

Distant- fatter, thinner shape

Question 8

Explain long-sighted vision

Answer 8

Can see things in distance clearly, but not near

• eyeball too short
• cannot see near object because the light rays to not meet on the retina so image is blurred

Question 9

Corrected long sight vision?

Answer 9

Converging lens bends light rays inwards before they enter the eye.

The light rays now meet on the retina so image is in focus

Question 10

Explain short- sight

Answer 10

Can see close things clearly, but not things far away

Distant object reflect light rays and the light rays meet in front of the retina so image is blurred

Question 11

Corrected short sight?

Answer 11

Diverging lens bends the light rays outwards before they enter the eye

The light rays now meet on the retina so final image in focus