State whether the following statement is true or false : Short-sightedness can be cured by using a concave lens.

What is the scientific name of

(a) short-sightedness, and (b) long-sightedness?

What kind of lens is used to correct (a) short-sightedness (b) long-sightedness?

Name the defect of vision in which the eye-lens loses its power of accommodation due to old age.

Name the defect of vision which makes the eye-lens cloudy resulting in blurred vision.