Related Experiment Video
Updated: Dec 25, 2025

Impression Cytology of the Lid Wiper Area
Published on: August 9, 2016
[Distinctive Wessely immune ring in keratitis-a chameleon]
Isabel Weinstein1, Fabian N Fries2, Nóra Szentmáry2
1Klinik für Augenheilkunde, Universitätsklinikum des Saarlandes UKS, Kirrberger Str. 100, 66421, Homburg, Deutschland. isabel.weinstein@uks.eu.
Abstract:
A Wessely immune ring can be found in various corneal infections as well as in non-infectious processes. Its appearance can aid in the differential diagnosis but can also be misleading. A definitive diagnosis can only be reached when all clinical and microbiological findings are taken into consideration. This article discusses and critically reflects on the differential diagnostic considerations and treatment strategies in the context of a case report on a 31-year-old patient with contact lenses and diffuse endothelial decompensation with a focal, mid-peripheral infiltrate and a Wessely immune ring.
Insights
The Wessely immune ring in corneal diseases can indicate infection or inflammation, but requires comprehensive clinical and microbiological data for accurate diagnosis. This case highlights its diagnostic challenges and management strategies.
Area of Science:
- Ophthalmology
- Corneal diseases
- Immunology
Background:
- The Wessely immune ring is a diagnostic sign observed in various corneal conditions, both infectious and non-infectious.
- Its presence can suggest specific pathologies but is not pathognomonic, necessitating careful interpretation.
- Accurate diagnosis relies on integrating clinical presentation with microbiological findings.
Observation:
- A case report details a 31-year-old contact lens wearer presenting with diffuse endothelial decompensation.
- The patient exhibited a focal, mid-peripheral corneal infiltrate alongside a Wessely immune ring.
- This presentation posed a diagnostic challenge due to the ambiguous nature of the immune ring.
Findings:
- The Wessely immune ring, while a useful sign, can be misleading in corneal diagnoses.
- Differential diagnosis requires a holistic approach, considering all clinical and microbiological evidence.
- Contact lens wear is a significant risk factor for microbial keratitis and other corneal complications.
Implications:
- This case underscores the importance of a thorough diagnostic workup for corneal infiltrates, especially in contact lens wearers.
- Understanding the differential diagnostic utility and limitations of the Wessely immune ring is crucial for effective patient management.
- Appropriate treatment strategies must be tailored based on confirmed diagnoses to prevent vision loss.

