1. Measuring used in the manufacture and checking of contact lenses;Nissel;The Optician,1962
2. A spherical contact lens measurement excercise; Part 1 rigid lenses;Port;J Brit Contact Lens Assoc,1986
3. A comparison of corneal lenses supplied to identical specifications;Shanks;Brit J Physiol Optics,1966
4. Contact lens edges contour and thickness;Silbert;Contacto,1965
5. A Sohnges control and measuring unit for hard and soft contact lenses;Sohnges;Contacto,1974