'Conoid' contact lenses

Historical Significance: Penrhyn Thomas (1918-2010) was a Sydney optometrist, who qualified in optometry at the Sydney Technical College in 1939 and was one of the pioneers of contact lens practice in Australia. He designed, produced and marketed his own lens designs and taught many optometrists how to fit contact lenses in the 1960s and 1970s. This is a copy from a text book by Thomas produced in excerpt form for his contact lens courses. Penrhyn Thomas introduced the Conoid lens in 1967 which consists of a steep central optic with tangential peripheral curve. . This is an early text book on contact lenses. See also Obrig 1942 (# 95), Dickinson 1946 (#176), Bier 1953 (#494), Mandell 1965 (# 507, Thomas 1960? (#558), Anderson 1944 (#575). For more information on Penhryn Thomas see his obituary published in Clin Exp Optom 2011 and also on this web site under the tab 'People who made history'. Three other copies of this excerpt are held at Cat No 581 and 558,See Cat no 3140 for the complete book in blue hardback 104 pages.