(1) Article 25A of the principal Scheme (mobility supplement) shall be amended in accordance with the following provisions of this Article.
(2) After sub-paragraph (c) of paragraph (1) there shall be added the following sub-paragraph:
(d) disablement as a result of his being both blind and deaf where by reason of the effects of those conditions in combination with each other he is unable, without the assistance of another person, to walk to any intended or required destination while out of doors.
(3) After paragraph (2) there shall be inserted the following paragraph—
(2A) For the purposes of paragraph (1)(d) a person is—
(a) blind only where the degree of disablement resulting from loss of vision has been assessed in accordance with Article 10 as amounting to more than 80 per cent.;
(b) deaf only where the degree of disablement resulting from loss of hearing has been assessed in accordance with Article 10 as amounting to not less than 80 per cent.