The Eye

Question 1

What happens to an object in someone who is long sighted , in someone’s eye

Answer 1

They struggle to see objects close , this is because :
The light cannot refract enough - so the image is formed behind the retina so the focal point is too far back

Question 2

What happens to an object in someone who is short sighted , in someone’s eye

Answer 2

They struggle to see objects from afar because the light is refracted too much so the image is formed infront of the retina - because the focal point is infront of the retina

Question 3

How do you treat a short sighted individual

Answer 3

You use a concaved lens

Question 4

How do you treat a long sighted individual

Answer 4

You use a convexed lens

Question 5

where on the retina should the light focus/meet

Answer 5

on the fovea on the retina

Question 6

When looking at a nearby object what does the eye do

Answer 6

• the ciliary muscles contract * the suspensory ligaments loosen * the lens is then thicker and refracts light rays strongly.

Question 7

When looking at an object far away what does the eye do

Answer 7

• the ciliary muscles relax * the suspensory ligaments are pulled tight * the lens is then pulled thin and only slightly refracts light rays.

Question 8

Another word for short sighted

Answer 8

myopia

Question 9

Another word for long sighted

Answer 9

hyperopia

Question 10

what do rods and cones cells detect

Answer 10

they both detect light but
Cone cells detect colour but Rods dont
The retina contains many cone and rod cells
retina connected to optic nerve connected to brain