(1) Subject to paragraph (2), the amendments made by regulations 3 and 4 of, and the Schedule to, these Regulations shall apply only in relation to a voucher—
(a) accepted or used pursuant to regulation 12 or regulation 18 of the principal Regulations on or after 1st April 1992; or
(b) sent to a health authority pursuant to regulation 14(2)(c) of the principal Regulations in respect of cost incurred on or after that date.
(2) Where—
(a) before 1st April 1992, a voucher has been issued under regulation 9(2) or (7), 10(3), 11(2) or 17(2) or (3) of the principal Regulations in relation to—
(i) a prescription for the supply of an appliance which was a complex appliance only by virtue of its containing a lenticular lens, or
(ii) the replacement or repair of such an applicance; or
(b) on or after 1st April 1992, a voucher is issued under regulation 10(4) of the principal Regulations to replace one issued prior to that date in relation to a prescription for the supply of an appliance which was a complex appliance only by virtue of its containing a lenticular lens,
the principal regulations shall apply to the use or redemption of that voucher in connection with the supply, replacement or repair of that appliance, or to the issue of that replacement voucher, on or after 1st april 1992 as if regulations 2, 3 and 4 of, and the schedule to, these regulations had not come into force.
(3) Where, on or after 1st April 1992—
(a) a testing or sight takes place pursuant to an application made before that date under regulation 13A of the 1986 Regulations; and
(b) at the time of such application, the applicant was an eligible person for the purposes of those Regulations under regulation 13(1)(d) thereof only by virtue of his need to wear an appliance containing a lenticular lens,
the 1986 Regulations shall apply in relation to that testing of sight as if regulation 5 of these Regulations had not come into force.