Description
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Product description
- The Hertel Exophthalmometer is a standardized, mirror-based instrument used to measure proptosis/exophthalmos—the forward position of the eye relative to the lateral orbital rim. By resting its footplates on the orbital rims and reading the corneal apex position on a calibrated scale, clinicians can quickly compare both eyes, document asymmetry, and track changes over time. It’s a key tool for monitoring thyroid eye disease, orbital inflammation/tumors, trauma, and post-operative outcomes, where consistent serial measurements guide clinical decisions.
- What it measures: Eye protrusion in millimeters (each eye) and inter-eye asymmetry
- How it’s used: Footplates on lateral orbital rims → align corneal apex reflection → read the scale; record base value and readings
- Common clinical uses: Thyroid eye disease, orbital mass/inflammation, trauma follow-up, post-op monitoring, unilateral proptosis workups
- Why it’s valuable: Quick, chairside measurement with repeatable serial tracking when the same instrument and technique are used
- Best practices: Use the same device for follow-ups, keep head position straight, note the base setting, and measure in consistent lighting
- Documentation tip: Record OD/OS values + base, date, and any symptoms (pain, diplopia, redness) for trend comparison
- Care: Clean contact surfaces with approved disinfectant; avoid scratching mirrors/scale; store in a protective case to preserve calibration
- Limitations to remember: Readings can vary with rim anatomy and technique—repeat measurements and average if needed
| Topic | Details |
| Purpose / Target Users | The Hertel Exophthalmometer is a diagnostic ophthalmic instrument used to measure exophthalmos (forward protrusion of the eye) by determining the distance between the corneal apex and the lateral orbital rim. It is commonly used in the evaluation and monitoring of conditions such as thyroid eye disease (Graves’ orbitopathy), orbital tumors, trauma, and other orbital pathologies. The instrument is primarily used by ophthalmologists, oculoplastic surgeons, optometrists, and eye care clinics. |
| Optotypes / Symbols | Not applicable. The Hertel Exophthalmometer is a measurement instrument, not a visual acuity device, and therefore does not include optotypes, letters, or symbols. |
| Scaling / Spacing | The device incorporates a precision millimeter scale used to measure the degree of eye protrusion relative to the orbital rim. The scale allows clinicians to obtain accurate and repeatable measurements of ocular protrusion for clinical monitoring. |
| Range of Acuity / Line Sizes | Not applicable. The instrument does not measure visual acuity and therefore does not include acuity line sizes. |
| Testing Distance | During examination, the Hertel Exophthalmometer is placed directly against the patient’s lateral orbital rims, allowing the clinician to observe the corneal apex through the instrument’s mirrors while reading the measurement scale. |
| Physical Size & Portability | The instrument is compact and handheld, designed for easy use in clinical settings. Its portable design allows ophthalmologists to perform measurements in clinics, hospitals, or diagnostic rooms. |
| Mounting / Display Features | The Hertel Exophthalmometer is handheld and positioned on the patient’s orbital rims during examination. It uses mirror-based viewing and a calibrated measurement scale to determine the degree of eye protrusion. No additional mounting or display system is required. |
| Included Accessories / Extras | The standard set typically includes the Hertel Exophthalmometer instrument and a protective metal storage case for safe transport and storage. |
| Durability / Material Qualities | The instrument is generally constructed from durable metal components with precision optical mirrors and calibrated measurement scales, ensuring reliable measurements and long-term clinical use. The protective metal case helps safeguard the instrument from damage during storage or transport. |
| Usability / Marker of Quality | A high-quality Hertel Exophthalmometer provides clear mirror optics, accurate millimeter scaling, stable orbital rim contact points, and consistent measurement repeatability. Durable construction and precise calibration make it a standard tool for monitoring orbital conditions and documenting exophthalmos progression in clinical practice. |
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