4(1)An impairment is to be taken to affect the ability of the person concerned to carry out normal day-to-day activities only if it affects one of the following—
(a)mobility;
(b)manual dexterity;
(c)physical co-ordination;
(d)continence;
(e)ability to lift, carry or otherwise move everyday objects;
(f)speech, hearing or eyesight;
(g)memory or ability to concentrate, learn or understand; or
(h)perception of the risk of physical danger.
(2)Regulations may prescribe—
(a)circumstances in which an impairment which does not have an effect falling within sub-paragraph (1) is to be taken to affect the ability of the person concerned to carry out normal day-to-day activities;
(b)circumstances in which an impairment which has an effect falling within sub-paragraph (1) is to be taken not to affect the ability of the person concerned to carry out normal day-to-day activities.