Scleral Depressor Marker

A scleral depressor marker is a specialized ophthalmic instrument that combines the functions of scleral depression and precision marking to streamline both diagnostic indirect ophthalmoscopy and vitreoretinal surgical procedures. Featuring a double‑ended design—one end shaped as a teardrop‑style depressor and the opposite end as a Gass or trephine‑style marker—this tool allows surgeons to indent the globe and delineate pars plana entry sites without repeatedly exchanging instruments. Constructed predominantly from polished stainless steel, reusable models offer corrosion resistance and can be sterilized per institutional protocols, while single‑use variants come pre‑sterilized for rapid turnover and reduced cross‑contamination risk.

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Design and Specifications

Most scleral depressor markers measure between 123 mm and 136 mm in overall length, providing sufficient reach into the orbital cavity while maintaining fine maneuverability. The depressor tip width typically ranges from 3 mm to 6 mm and is shaped to atraumatically indent the sclera under indirect illumination. Marker tip diameters vary—common sizes include 1.5 mm for Gass markers and up to 4.0 mm for trephine‑style ends—ensuring precise sclerotomy site marking. Handles are designed flat or square with serrated or rib‑bed surfaces to enhance grip during delicate globe manipulations.

Applications

Thimble‑type scleral depressors—first popularized by Schepens—allow fingertip control for thorough peripheral retinal examination during indirect ophthalmoscopy, enabling visualization of lesions beyond the direct line of sight. In vitreoretinal surgery, the marker end is critical for delineating pars plana trocar or injection sites, improving safety and consistency in gas, fluid, or drug delivery procedures.

Variants and Models

• O’Connor Scleral Depressor‑Marker (E5109): 3 mm teardrop depressor end and 1.5 mm Gass marker end on a 133 mm shaft.

• Schocket Double‑Ended Depressor‑Marker (E5108): 6 mm bar‑style depressor and 2.5 mm teardrop marker, overall length 134 mm.

• Laqua Model G‑32150: 1.8 mm × 3.0 mm teardrop depressor tip with 2.0 mm marker on a square‑handle instrument measuring 5½ inches.

• Hasa Optix Single‑Use Depressors: Pre‑sterilized, fully recyclable stainless steel variants available in multiple tip configurations for cost‑effective, high‑volume settings.

Selection Considerations

When selecting a scleral depressor marker, assess tip dimensions against the intended procedural use, choose handle ergonomics that enhance comfort and stability, and determine whether single‑use or reusable instruments best fit your practice’s sterilization workflows. Single‑use models reduce cross‑contamination risk in busy clinics, whereas reusable stainless steel instruments may offer long‑term cost savings in dedicated surgical suites. Always verify that marker tip sizes align precisely with the sclerotomy dimensions required for trocar insertion or drug delivery to optimize safety and procedural accuracy.