Biomedical subjects
Publications and source records attributed to P S Greenfield.
A recent case of cyclic esotropia is reported. Factors precipitating the cycle and theories about the clock mechanism are discussed. At present the exact nature and location of the clock mechanism remains speculative.
Two cases of hypoplasia of the optic nerve associated with porencephaly are described. The clinicopathological correlation of the double ring sign is presented and the possible mechanism of optic nerve hypoplasia being a secondary degeneration is discussed.