The Columbia Thyroid Eye Disease-Compressive Optic Neuropathy Diagnostic Formula

Area of Science:

• Ophthalmology
• Endocrinology
• Neurology

Background:

• Thyroid eye disease-compressive optic neuropathy (TED-CON) diagnosis is challenging, particularly without a relative afferent pupillary defect (RAPD).
• Limited large-scale case series and accessible diagnostic tools exist for TED-CON.
• Accurate diagnosis of TED-CON is crucial for timely intervention and vision preservation.

Purpose of the Study:

• To develop a mathematical formula for accurately predicting the presence or absence of TED-CON.
• To utilize key clinical measures of optic neuropathy in the predictive formula.
• To provide a practical diagnostic aid for clinicians managing TED-CON.

Main Methods:

• Retrospective case series comparing 108 TED-CON patients with 41 age-matched non-compressive TED patients.
• Analysis of clinical variables assessing optic nerve function and compressive disease risk.
• Application of generalized linear regression modeling to derive a predictive formula.

Main Results:

• The derived formula (y = -0.69 + 2.58 × APD - 0.31 × LID - 0.2 × MD - 0.02 × CP) predicted CON with 82% accuracy.
• The formula demonstrated 83% sensitivity and 81% specificity in predicting TED-CON.
• In cases lacking RAPD (63% of CON orbits), the formula maintained 78% accuracy with 73% sensitivity and 83% specificity.

Conclusions:

• The developed Columbia TED-CON Diagnostic Formula (CTD Formula) aids in accurate TED-CON diagnosis.
• The formula is particularly valuable in bilateral TED-CON cases and when RAPD is absent.
• The CTD Formula offers a guided approach for clinicians in diagnosing TED-CON.