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

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

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

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

What is the other name of old age hypermetropia?