8.2 Ophthalmic instrument identification

Common Ophthalmic Surgical Instruments

Instrument identification is a reliable source of COT questions because the assisting technician must recognize each tool on sight and anticipate when the surgeon will need it. Instruments are grouped by function.

Exposure and Fixation

• Lid speculum — a spring or screw device that holds the eyelids apart, keeping lashes and lid margins out of the field.
• Fixation forceps / 0.12 forceps — fine forceps with tiny (0.12 mm) teeth that grasp conjunctiva or sclera to stabilize and rotate the globe.

Forceps

• Tying forceps — smooth, non-toothed jaws used to tie and manipulate suture; the smooth surface avoids cutting the suture.
• Colibri forceps — angled forceps with fine teeth used to grasp the cornea during incision and wound manipulation.
• Capsulorhexis (Utrata) forceps — fine forceps that grasp the anterior-capsule flap and tear it into a continuous circular opening.

Cutting Instruments

• Keratome — an angled blade that creates the self-sealing clear-corneal incision; a crescent blade enlarges tunnels and an MVR blade makes the paracentesis.
• Cystotome — a bent needle (often made from a 25- to 27-gauge needle) used to puncture the anterior capsule and initiate the capsular tear.

Needle Holders and Measuring

• Needle holder — a locking or non-locking instrument that grasps curved suture needles for wound closure or scleral fixation.
• Calipers — a graduated measuring instrument used to mark incision width, capsulorhexis diameter, or distances in millimeters.

Phaco and Aspiration

• Phacoemulsification handpiece — an ultrasonic tip that fragments (emulsifies) and aspirates the lens nucleus while irrigating the chamber.
• Irrigation/aspiration (I/A) handpiece — removes residual lens cortex while maintaining a formed anterior chamber.
• Viscoelastic (OVD) cannula — injects a cohesive or dispersive viscoelastic to maintain space and protect the endothelium.

Manipulators and Adjuncts

Several small hand instruments round out the tray. A nucleus chopper or second instrument enters through the paracentesis to split and stabilize the nucleus during phaco. A blunt Sinskey (or Kuglen) hook rotates and dials the IOL into position within the capsular bag. A muscle hook engages an extraocular muscle in strabismus cases, and iris retractors (hooks) enlarge a small pupil. Absorbent triangular cellulose (Weck-cel) sponges wick fluid and blood from the field, and a cannula on a syringe irrigates or hydrates the wound. Recognizing these by shape and knowing their sequence in the case lets the technician anticipate the surgeon's next request. Before the case begins, the technician typically sets up the sterile tray, arranges instruments in the order they will be used, confirms that the phaco cassette and tubing are connected, and participates in the count of sharps and sponges so that nothing is inadvertently left near the eye.

Instrument-to-Use Quick Reference

Instrument Care, Handling, and Sterilization

Ophthalmic microsurgical instruments are delicate and expensive, and even minor tip damage can ruin a capsulorhexis or nick a suture. Careful handling and reprocessing are therefore part of the technician's responsibility.

Handling and Cleaning

• Protect fine tips with instrument guards, and never let tips touch or bang against other metal.
• Keep instruments moist after use so debris does not dry on; enzymatic cleaners help dissolve protein and viscoelastic residue.
• Inspect tips under magnification for burrs, misalignment, or bent teeth before packaging.
• Flush cannulated instruments (phaco tip, I/A, cannulas) to clear lens material; retained material can trigger toxic anterior segment syndrome (TASS), a sterile inflammatory reaction from contaminated or improperly cleaned instruments.

Sterilization and Verification

Steam sterilization in an autoclave (typically 121 C / 250 F for a set time, or a higher-temperature short cycle) is the standard method for heat-stable instruments. Verification uses three layers of monitoring:

1. Mechanical indicators — the autoclave's own time, temperature, and pressure readouts.
2. Chemical indicators — heat-sensitive tape or strips that change color to show a package was exposed to sterilizing conditions (this confirms exposure, not sterility).
3. Biological indicators — vials of resistant Geobacillus stearothermophilus spores that are incubated after the cycle; no growth confirms that even spores were killed, making this the definitive proof of sterility.

Immediate-use (flash) sterilization is reserved for a single item needed urgently and is not a substitute for routine terminal sterilization of the full tray. Instruments that cannot tolerate heat may be processed by low-temperature methods, but steam remains the preferred choice whenever a device is heat- and moisture-stable. Packages are dated and stored so that sterility is maintained until the point of use, and any package that is torn, wet, or dropped is considered contaminated and must be reprocessed.