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Automated Charting of the Visual Space of Housefly Compound Eyes
08:34

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Published on: March 31, 2022

Recognizing the protruding eye.

Lily Koo Lin1, Christopher M Andreoli, Mark P Hatton

  • 1Eye Plastics, Orbit, and Cosmetic Surgery, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA. lily.lin@ucdmc.ucdavis.edu

Orbit (Amsterdam, Netherlands)
|October 7, 2008
PubMed
Summary
This summary is machine-generated.

The threshold for detecting exophthalmos (protrusion of the eyeball) visually is approximately 4 millimeters. Mild cases of 1-3 mm may appear normal, potentially leading to missed diagnoses.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Clinical Observation

Background:

  • Exophthalmos, or protruding eyeballs, can be a sign of various orbital conditions.
  • The degree to which exophthalmos is visually detectable by observers is not well-established.

Purpose of the Study:

  • To determine the minimum degree of exophthalmos that is perceptible to human observers.
  • To establish a clinical threshold for the visual detection of exophthalmos.

Main Methods:

  • A study group of 28 photographs of patients with unilateral exophthalmos (1-11 mm) and 28 control photographs were selected from a medical database.
  • One hundred ophthalmology professionals and technicians reviewed the photographs, classifying them as 'normal' or 'abnormal.'

Main Results:

  • Control subjects were correctly identified as 'normal' 81% of the time.
  • Patients with 1-3 mm of exophthalmos were identified as 'normal' in 60-46% of cases.
  • Exophthalmos greater than or equal to 4 mm was increasingly identified as 'abnormal,' with 91.9% of 6 mm cases and 97.9% of >6 mm cases recognized as abnormal.

Conclusions:

  • Exophthalmos exceeding 4 mm is generally perceptible to observers.
  • Mild exophthalmos (1-3 mm) may be visually indistinguishable from normal appearance.
  • There is a risk of missing orbital pathology in patients with 3 mm or more of exophthalmos during routine examinations.