[The prognosis of extracapsular extraction methods in cataract]

For the purpose of prognosticating the method of extracapsular cataract extraction ultrasound, quantitative echography (a-method) was conducted in 207 patients in the preoperative period. The value of ultrasound attenuation in decibels in lenses of different density was determined by a tentative way. It is established that the most optimum condition for aspiration is "acoustic lens density" to 9 decibels, for phacoemulsification--from 10 to 15 decibels, for usual extracapsular cataract extraction--above 15 decibels and higher. In all patients during the operation the results of quantitative echography were compared with the real density of the lens. In all cases full coincidence of "echographic" and real density was recorded. The proposed method is objective and the obtained figure values allow to recommend the method of extracapsular cataract extraction.