Ophthalmic Surgery: Cataract Extraction, Vitrectomy, and Corneal Procedures

Ophthalmic Surgery: Cataract Extraction, Vitrectomy, and Corneal Procedures

Ophthalmic surgery is performed on some of the most delicate tissues in the human body. The surgical technologist working in an ophthalmic suite must master microsurgical technique, sterile field management on a very small scale, and a precise understanding of the procedural sequence. Errors that would be minor in general surgery can permanently damage vision. Patient safety depends on your attention to detail at every step.

The Ophthalmic Sterile Field

The ophthalmic mayo stand is set up differently from a general surgery tray. Instruments are tiny, lightweight, and easily damaged. Always handle them by the handle, never the tip. Lay each instrument flat with tips pointed away from the edge of the field and never stacked. Many programs use magnifying loupes during setup and case performance to verify instrument condition and placement. Before the case begins, inspect every tip under magnification for burrs, misalignment, or debris. A bent or contaminated microsurgical tip can cause corneal or lens-capsule injury.

The ophthalmic drape isolates the eye and provides a small sterile work surface. It typically incorporates an adhesive aperture that adheres directly to the periorbital skin, securing the drape and reducing the risk of it shifting during the procedure. Place irrigating solutions, viscoelastic syringes, and intraocular lens (IOL) supplies in an organized, consistent layout so you can retrieve any item without looking away from the field.

Cataract Extraction by Phacoemulsification

Cataract extraction is one of the most commonly performed surgical procedures in the United States. The standard modern technique is phacoemulsification (phaco), in which ultrasonic energy emulsifies the cloudy crystalline lens so it can be aspirated through a small self-sealing incision, usually less than 3 mm.

Procedural sequence:

1. Incision. The surgeon creates a corneal or scleral tunnel incision, often with a keratome or diamond blade. A paracentesis port is added for the second instrument.

2. Viscoelastic injection. An ophthalmic viscosurgical device (OVD), commonly called viscoelastic, is injected into the anterior chamber to protect the corneal endothelium and maintain space.

3. Capsulorhexis. A continuous curvilinear capsulorhexis (CCC) tears a circular opening in the anterior lens capsule. The instrument used is a cystotome needle or capsulorhexis forceps.

4. Hydrodissection. Balanced salt solution (BSS) is injected beneath the capsule to separate the lens nucleus from the capsule.

5. Phacoemulsification. The phaco handpiece, connected to the phacoemulsification unit via tubing, is introduced. Ultrasonic vibration at the tip emulsifies the nucleus while simultaneous irrigation (BSS) and aspiration maintain chamber pressure and remove lens material.

6. Irrigation/Aspiration (I/A). After the nucleus is removed, a separate I/A handpiece removes remaining cortical lens material.

7. IOL implantation. The posterior lens capsule is left intact as a scaffold. The surgeon inserts a foldable IOL using an IOL injector; the lens unfolds within the capsular bag.

8. OVD removal. Viscoelastic is aspirated to prevent postoperative pressure elevation.

9. Incision hydration/closure. The self-sealing corneal wound is hydrated with BSS; sutures are rarely needed for small-incision phaco.

Scrub technologist actions include preparing and loading the IOL injector immediately before use, flushing the phaco handpiece tubing to confirm flow and remove air, passing instruments with tips protected, and keeping the sterile field free of excess fluid.

Phacoemulsification Equipment Setup

The phaco machine combines ultrasound, irrigation, and aspiration in one console. The scrub tech is responsible for connecting the sterile tubing cassette to the handpiece and confirming the system is primed and bubble-free before the surgeon uses it. Always follow the manufacturer's instructions for the specific unit in your facility. Verify that irrigation fluid is flowing freely and that aspiration lines are not kinked. A clogged or air-filled line during the case can cause anterior chamber collapse, risking serious ocular injury.

Vitrectomy Overview

Vitrectomy removes the vitreous gel from the posterior segment of the eye and is indicated for retinal detachment, vitreous hemorrhage, macular conditions, and other posterior-segment pathology. Three small-gauge ports (commonly 23-, 25-, or 27-gauge) are placed through the pars plana. Instruments include the vitrector (cutting/aspiration handpiece), light pipe for intraocular illumination, and an infusion cannula to maintain intraocular pressure. The scrub tech sets up the vitrectomy pack, connects the infusion line, and ensures the light source cable is patent.

Corneal Procedures

Keratoplasty (corneal transplant) replaces diseased corneal tissue with donor tissue. Penetrating keratoplasty (PK) replaces the full thickness of the cornea; endothelial keratoplasty procedures such as DSAEK or DMEK replace only the posterior layers. Trephines are used to cut both donor and recipient tissue. Fine sutures (typically 10-0 nylon) require microsurgical needle holders and tying forceps. Handle donor tissue with extreme care; it must remain moist and be used within the time specified by the eye bank.

Safety Principles for Ophthalmic Surgery

• Never use a towel clip on an ophthalmic drape over the eye — it can cause orbital or globe injury.
• Confirm all irrigation solutions are labeled, at correct concentration, and free of particulate matter before entering the sterile field.
• Keep tips of all microsurgical instruments protected when not in use.
• IOLs are implanted devices; verify the correct lens power from the surgeon's order against the label on the IOL package before opening.
• Scope of practice: the surgical technologist sets up, assists, and maintains the sterile field — the surgeon makes all incisions and intraocular decisions.