The Section 320 in India defines grievous hurt. The punishment is enhanced when the hurt is grievous.
The Text
The following kinds of hurt only are designated as "Grievous":
Emasculation
Permanent privation of the sight of either eye
Permanent privation of the hearing of either ear
Privation of any member or joint
Destruction or permanent impairing of the powers of any member or joint,
Permanent disfiguration of the head or face
Fracture or dislocation of a bone or tooth,
Any hurt which endangers life or which causes the sufferer to be during the space of twenty days in severe bodily pain, or unable to follow his ordinary pursuits.
References
Section 320 in the Indian Penal Code Wikipedia(Text) CC BY-SA