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

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

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

What is the other name of old age hypermetropia?

Name any two defects of vision which can be corrected by using spectacles.