Artificial pacemaker is required when a person is suffering from

Artificial pacemaker is required when a person is sufering from

Artificial pacemaker is required during treatment of

Artificial pacemaker is required during treatment of

Haemodialysis is done when the person is suffering from:

A person may suffer from both myopia and hypermetropia defects. (a) What is this condition called? (b) When does it happen? (c) Name the type of lens often required by the persons suffering from this defect. Draw labelled diagram of such lenses.