IS_Unit10_Checkpoint 10.5_E

[E] 1(a) What is the problem of short sight?

• Cannot see distant objects clearly

• Cannot see near objects clearly

[E] 1(b) What are the causes of short sight?

• The lens is too thick or the eyeball is too long.

• The lens is too thick or the eyeball is too short.

• The lens is too thin or the eyeball is too long.

• The lens is too thin or the eyeball is too short.

[E] 1(c) Short sight can be corrected by wearing

• glasses with convex lenses

• glasses with concave lenses

[E] 1(d) What is the problem of long sight?

• Cannot see distant objects clearly

• Cannot see near objects clearly

[E] 1(e) What are the causes of long sight?

• The lens is too thick or the eyeball is too long.

• The lens is too thick or the eyeball is too short.

• The lens is too thin or the eyeball is too long.

• The lens is too thin or the eyeball is too short.

[E] 1(f) Long sight can be corrected by wearing

• glasses with convex lenses

• glasses with concave lenses

[E] 1(g) What is the problem of astigmatism?

• Cannot see distant objects clearly

• Cannot see near objects clearly

• Blurred vision

• Cannot distinguish between colours

[E] 1(h) What is the cause of astigmatism?

• The cornea or the lens is unevenly curved.

• The lens becomes cloudy.

• One or more types of cone cells not working properly.

[E] 1(i) Astigmatism can be corrected by

• wearing glasses with specially made lenses.

• replacing the lens with an artificial lens.

• It cannot be corrected.

[E] 1(j) What is the problem of cataract?

• Cannot see distant objects clearly

• Cannot see near objects clearly

• Blurred vision

• Cannot distinguish between colours