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Related Experiment Video

Updated: Feb 7, 2026

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Iris Trabecular Contact on OCT in Angle Closure Progression.

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Summary
This summary is machine-generated.

Iridotrabecular contact (ITC) on AS-OCT images indicates a higher risk of primary angle closure (PAC) progression. Nasal ITC presence and length, particularly in nasal or superior sectors, are key indicators for identifying patients at risk.

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Area of Science:

  • Ophthalmology
  • Anatomic studies
  • Medical imaging

Background:

  • Anterior segment optical coherence tomography (AS-OCT) is crucial for predicting primary angle closure (PAC) progression.
  • Ocular biometrics from AS-OCT are effective but require time and specialized software.
  • Iridotrabecular contact (ITC) is a visible feature on AS-OCT, offering a potentially simpler risk stratification method.

Purpose of the Study:

  • To determine the association between iridotrabecular contact (ITC) presence and length on AS-OCT images and the 72-month progression from primary angle closure suspect (PACS) to primary angle closure (PAC).

Main Methods:

  • A retrospective cohort study analyzed untreated eyes of participants aged 50-70 with bilateral PACS from the ZAP trial.
  • ITC presence and length were assessed on AS-OCT images.
  • Progression to PAC was defined by elevated intraocular pressure, peripheral anterior synechiae, or acute angle closure.
  • Age-adjusted Cox regression models evaluated risk factors for progression.

Main Results:

  • Nasal ITC presence was linked to a significantly higher risk of angle closure progression (HR, 4.68).
  • Increased ITC length in the nasal (HR, 1.64 per 250 µm) and superior (HR, 1.72 per 250 µm) sectors also correlated with greater progression risk.
  • ITC extent and cumulative gonioscopy score did not show significant associations with progression.

Conclusions:

  • Nasal ITC presence and nasal/superior ITC length are associated with increased risk of progression from PACS to PAC over 72 months.
  • Qualitative ITC assessment on AS-OCT provides a practical alternative to quantitative biometric analysis for identifying high-risk PACS eyes.