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Precision Pulse Capsulotomy Device Evaluated

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An intraoperative method which created a precision pulse capsulotomy (PPC) on the patient’s visual axis that was then used as a surrogate visual axis marker for centering an intraocular lens (IOL) during cataract surgery was found to produce consistent alignment to the visual axis, according to an evaluation by Vance Thompson, MD, founder of Vance Thomson Vision in North Dakota, who presented his findings during the American Society of Cataract and Refractive Surgery’s 2018 annual meeting in Washington, DC.

Participants (n=86) received capsulotomies centered on the visual axis using the precision pulse capsulotomy device following cataract surgery and implantation with a premium IOL. After instructing patients to fixate on a specific microscope light, investigators identified the P1 Purkinje image, denoting the true visual axis. They then centered the PPC suction cup or PPC capsulotomy ring on P1 and made a capsulotomy. Following phacoemulsification, researchers centered the IOL on the capsulotomy, which served as a surrogate marker for the visual axis. Among the results:

  • All patients were able to follow fixation instructions.
  • The manipulation to center the PPC device on P1 was aided by leaving the rigid push rod in the device neck to increase responsiveness to surgeon maneuvers.
  • The clear PPC suction cup allowed patient fixation to be maintained on the appropriate light during the procedure.
  • All PPC capsulotomies were complete and free floating.
  • Their intrinsic roundness and 5.2mm average diameter facilitated IOL centration within the capsulotomy.

Thompson V. Anchoring premium IOL cataract surgery to the patient’s visual axis using precision pulse capsulotomy device: methodology and evaluation. Talk presented at: 2018 ASCRS-ASOA Annual Meeting; April 13-17, 2018; Washington, DC.

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