title: [Research on measurement of crystalline lens hardness by ultrasonic attenuation (author's transl)].
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging; D005260:Female; D006245:Hardness Tests; D006801:Humans; D007908:Lens, Crystalline; D008297:Male; D008875:Middle Aged; D014465:Ultrasonics; D014783:Viscosity