With its acquisition of nine Black & Lizars shops, the Duncan and Todd Group has become the largest retail optical chain in Scotland. The deal increases the number of shops by about a third, expanding the staff by about 56 and adding seven locations, notably in the towns of Perth and Stirling and around the west coast. Duncan and Todd was founded in 1973 and also offers hearing care. Its retail brands include 20 20 Opticians, JM MacDonald and Douglas Dickie Opticians. The group also operates a laboratory called Caledonian Optical.