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Kahook Dual Blade Goniotomy

Surgeon: Lindsay Machen, MD | Year: 2020

Dr. Machen performs a goniotomy using the Kahook Dual Blade. A gonioprism is used to visualize the nasal trabecular meshwork. The blade engages the trabecular meshwork then is advanced through Schlemm’s canal to excise the trabecular meshwork. The blade is flipped to repeat the other direction, then the strips are connected and removed using intraocular forceps and the I/A handpiece.

Sample Operative Report


1. Cataract, *** eye
2. Glaucoma, *** eye




1. Phacoemulsification cataract extraction with intraocular lens implantation, *** eye
2. Kahook Dual Blade goniotomy, *** eye






*** *** diopters, serial number ***, aim ***


MAC and topical



Description of Procedure:

Prior to the date of surgery, the risks, benefits, and alternatives of the planned procedure were discussed with the patient, and informed consent was obtained. The patient was identified in the preoperative area by the attending physician, and the operative eye was marked. The patient was taken to the operative suite and given IV sedation and topical ocular anesthesia. The operative eye was prepped and draped in the usual sterile ophthalmic fashion. A lid speculum was inserted.

A paracentesis was made into clear cornea. Epi-Shugarcaine and viscoelastic were injected into the anterior chamber. A clear corneal incision was made using a keratome. A cystotome was used to initiate a capsular flap, and Utrata forceps were used to create a continuous curvilinear capsulorrhexis. Hydrodissection was performed using balanced salt solution on a blunt-tipped cannula. A phacoemulsification handpiece was used to disassemble and remove the lens nucleus. An irrigation/aspiration handpiece was used to remove the remaining cortical material and polish the capsule. The anterior chamber and capsular bag were filled with viscoelastic. The intraocular lens was placed into the bag and dialed into position.

The patient’s head was then rotated 35 degrees away from the surgeon, and the operating microscope was rotated 35 degrees toward the surgeon. Additional viscoelastic was injected into the anterior chamber to inflate the nasal angle and onto the cornea to serve as a coupling agent. A direct gonioprism was used to visualize the nasal angle. The trabecular meshwork was easily identified. The Kahook Dual Blade was then used to perform an ab-interno goniotomy for approximately 180 degrees from the superonasal quadrant through the inferonasal quadrant. Adequate incision and excision of trabecular meshwork were achieved with mild bleeding, and a long strip of trabecular meshwork was removed.

The patient’s head and the operating microscope were then rotated back into neutral positions. All remaining viscoelastic was removed using the irrigation/aspiration handpiece. The corneal incisions were hydrated with balanced salt solution then inspected with a Weck-cel sponge and found to be watertight with good intraocular pressure by finger tension. The lens was inspected and found to be centered in the capsular bag. The speculum and drapes were removed, and antibiotic-steroid drops were placed into the eye. The patient was then transported to the postoperative care unit in good condition.