Topic 5 Correcting Vision Defects

Question 1

What is the medical term for longsightedness

Answer 1

Hyperopia

Question 2

What do people who are long sighted stuggle with

Answer 2

Unable to focus on near objects

Question 3

What causes longsightedness

Answer 3

When the lens is too thin and doesn’t refract light enough
When the eye ball is too short

Question 4

Where are the images of near objects brought to focus if a person is long sighted

Answer 4

Behind the retina

Question 5

What lenses can be used to correct hyperopia

Answer 5

Convex lens which refracts the light to focus on the retina

Question 6

What is the medical term for shortsightedness

Answer 6

Myopia

Question 7

What are shortsighted people unable to do

Answer 7

Unable to focus on distant objects

Question 8

When does shortsightedness occur

Answer 8

When the lens is too curved and refracts the light too much
When the eye ball is too long

Question 9

Where are the images of the distant object brought into focus

Answer 9

In front of the retina

Question 10

What ensues can be used to correct myopia

Answer 10

Concave lenses so that the light rays focus on the retina

Question 11

What are 3 treatments for vision defects

Answer 11

Contact lenses
Laser eye surgery
Replacement lens surgery

Question 12

What are contact lenses

Answer 12

Thin lenses that sit on the surface of the eye and are shaped to compensate for the fault in focusing

Question 13

Why are contact lenses popular

Answer 13

Lightweight and invisible

Question 14

Why are contact lenses more convenient

Answer 14

More convenient for sports than glasses

Question 15

What are the main two types of contact lenses

Answer 15

Hard and soft lenses

Question 16

Pros and cons of soft lenses

Answer 16

Generally more comfortable but higher risk of eye infections

Question 17

What is done in laser eye surgery

Answer 17

Laser used to vaporise tissue changing the shawl of the cornea (so changing how strongly it refracts light)

Question 18

What does slimming down the cornea do

Answer 18

Makes it less powerful and can improve short sightedness

Question 19

What does changing the shape of the cornea so that it is more powerful improve

Answer 19

Long sightedness

Question 20

What are the risks of laser eye surgery

Answer 20

Can cause complications such as infection or the eye reacting in a way that makes your vision worse than before

Question 21

What is replacement lens surgery more effective doe

Answer 21

Longsightedness

Question 22

What is replacement lens surgery

Answer 22

The natural lens of the eye is removed and an artificial lens made of clear plastic is inserted

Question 23

Why does replacement lens surgery carry higher risks than laser eye surgery

Answer 23

Because it involves work inside the eye and could cause possible damage to the retina which can lead to loss of sight