(1) The Commonwealth is liable to pay compensation under section 68 in respect of a single aggravated injury or disease only if:
(a) for an aggravation of, or a material contribution to:
(i) hearing loss; or
(ii) the loss, or the loss of the use, of a finger or toe; or
(iii) the loss of the sense of taste or smell;
the impairment suffered by the person as a result of the aggravation or material contribution constitutes at least 5 impairment points; and
(b) otherwise--the impairment suffered by the person as a result of the aggravation or material contribution constitutes at least 10 impairment points.
(2) The amount of compensation that the Commonwealth is liable to pay in respect of the person's aggravated injury or disease is the amount payable in respect of the impairment points of the person, and the effect on the person's lifestyle, from the aggravation or material contribution.