Motor Vehicles Act, 1988
142. Permanent disablement.
For the purposes of this Chapter, permanent disablement of a person shall be deemed to have resulted from an accident of the nature referred to in sub-section (1) of section 140 if such person has suffered by reason of the accident, any injury or injuries involving--
Permanent privation of the sight of either eye or the hearing of either ear, or privation of any member or joint; or
Destruction or permanent impairing of the powers of any member or joint; or
Permanent disfiguration of the head or face.