A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing :

The defect of vision in which the eye-lens of a person gets progressively cloudy resulting in blurred vision is called:

A person cannot see distant objects clearly. His vision can be corrected by using the spectacles containing:

In a certain murder investigation, it was important to discover whether the victim was long-sighted or short-sighted. How could a detective decide by examining his spectacles?

The picture given here shows a person wearing 'half-moon' spectacles. What sort of eye-defect do you think he has ? Why are these particular spectacles useful to him?