Vision Defects:

Question 1

Short sighted people can:

Answer 1

See near objects clearly, but struggles to focus on far away objects

Question 2

Short sightedness is caused by which two things?

Answer 2

The lens of the eye being too powerful and resulting in the light coming to a principal focus in front of the retina, or the eye being elongated.

Question 3

How is short sightedness corrected?

Answer 3

By placing a diverging lens in front of the lens of the eye, spreading the light out before it enters the eye so the light gets properly focused onto the retina.

Question 4

Long sighted people can:

Answer 4

See distant objects clearly, but have an inferior near point (the closest distance the eye can focus on) to normal sighted people.

Question 5

Long sightedness is cause by:

Answer 5

The eye being too short, resulting in the light being focused behind the retina or the lens being too weak to converge the light properly.

Question 6

Long sightedness is corrected by:

Answer 6

Placing a converging lens in front of the eye

Question 7

The power of a diverging lens is always

Answer 7

Negative, because the focal point is in front of the lens

Question 8

How does laser eye surgery work?

Answer 8

Laser cuts into the cornea so that the light focuses correctly on the retina