Ultra-high-speed digital video images of vibrations of an ultrasonic tip and phacoemulsification

Abstract

The study visually showed that continuous-mode US produces chattering motion, while micropulse-mode US produces hyper-followability.

Intraoperative performance and postoperative outcome comparison of longitudinal, torsional, and transversal phacoemulsification machines

“…3 The tendency of nuclear fragments to bounce against the tip is known as chatter, which has been associated with damage to the corneal endothelium as a result of direct mechanical abrasion by fragments. 4 In addition, chatter results in decreased cutting efficiency and consequently longer phacoemulsification times and higher power settings, which have been reported to cause increased endothelial damage. [5][6][7] Longitudinal tip movement is also associated with reduced followability, defined as the ease by which lens fragment material can be smoothly and progressively aspirated into the tip aperture without being repulsed away.…”

“…2,20 Although cavitation has been implicated as a cause of endothelial damage through the formation of free radicals, this mechanism remains controversial. [2][3][4]20,21 Surgical outcomes were graded based on visual acuity, corneal thickness, and central corneal edema 1 day postoperatively. Evidence has shown that postoperative day 1 corneal thickness and edema is an effective measure of surgically induced endothelial damage as a result of alterations in pump and barrier function.…”

Real-time intraoperative high-speed imaging during phacoemulsification

“…Miyoshi et al 10 described this as lens milk. These jets of plume were clearly visible in the slow-motion film compared with the normal-speed video.…”

“…[8][9][10][11][12][13][14][15] However, all these studies were performed in a laboratory setting by simulating phacoemulsification. To our knowledge, this is the first report of the application of high-speed imaging in a real-time operating scenario during phacoemulsification.…”

“…9 Several authors have used high-speed cameras to evaluate and understand various processes including the role of cavitation and the jackhammer effect in phacoemulsification, fluid and phaco tip movements during phacoemulsification, and dynamics in the choriocapillaris. [10][11][12][13][14][15] However, all the studies have used this technology in experimental conditions in the laboratory.…”