<prompt> Phacoemulsification is done withLaserUltrasoundCryoUV light  <response>: Ans. b Ultrasound Ref: AK Khurana, 4th ed, p. 193In phacoemulsification nucleus is emulsified aspirated by phacoemulsification. Phacoemulsifier acts through a titanium needle hollow 1 mm needleIt vibrates in its longitudinal axis at an ultrasonic speed of40000 times a second and thus emulsifies nucleusAdvantage: Very small corneoscleral incision 3.2-3.5 mm, hence sutureless surgeryNOTE:Various surgical techniques with length of corneoscleral incisionECCE- 7-8 mm 120degICCE- 10-12 mm 180degSmall incision cataract surgery SICS - 4-6 mmPhacoemulsification- 3.2-3.5 mm 30deg 