19. Where it appears to a Board that provision is required to meet the needs of the residents of any particular district in the Board area, the Board may, after consultation with the area optical committee and with the approval of the Scottish Ministers, make arrangements with an optician or an ophthalmic medical practitioner whereby the optician or the ophthalmic medical practitioner undertakes to provide general ophthalmic services at suitable centres in that district on such terms as may be specified in the arrangements.