“…Many types of instrument have been devised for the operation. Many of them have been concerned with precise replacement of the volume of fluid aspirated in order to avoid loss of the anterior chamber (Fink and Weinstein, 1964;Atchoo, 1968;Phillips and Wang, 1971). With the use of the operating microscope equipped with an observer's viewing eyepiece and with the help of a competent assistant it is quite possible to maintain the depth of the anterior chamber throughout by syringing fluid gently into the anterior chamber with one syringe while at the same time aspirating fluid and lens matter with another (Ferguson, 1964;Girard, 1967;O'Gawa, 1967;Bruun-Jensen, 1969;Rice, 1977).…”