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Updated: Jun 13, 2026

Pupillary Response as Assessment of Effective Seizure Induction by Electroconvulsive Therapy
04:51

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Published on: April 11, 2019

New considerations on pupillary block mechanism.

Sebastião Cronemberger1, Nassim Calixto, André Oliveira de Andrade

  • 1Federal University of Minas Gerais School of Medicine - Belo Horizonte (MG) - Brazil. cronem@task.com.br

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Summary

Pupillary block mechanisms in eyes with occludable angles were studied using ultrasound biomicroscopy. Findings suggest pupillary block may not be the primary cause of acute primary angle-closure.

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Area of Science:

  • Ophthalmology
  • Anatomy
  • Biomedical Imaging

Background:

  • Occludable angles are a risk factor for angle-closure glaucoma.
  • Pupillary block is a theorized mechanism for acute primary angle-closure.
  • Understanding these mechanisms is crucial for effective treatment strategies.

Purpose of the Study:

  • To investigate the mechanisms of pupillary block in eyes with occludable angles.
  • To utilize ultrasound biomicroscopy (UBM) for detailed ocular measurements.
  • To evaluate changes under varying light conditions and after laser peripheral iridectomy.

Main Methods:

  • A pilot study involved 13 eyes with acute primary angle-closure, measuring angle, posterior chamber depth, and iris thickness under light/dark conditions.
  • A second study on 32 eyes measured iris-lens contact distance and angle, and anterior chamber depth before and after laser peripheral iridectomy.
  • Ultrasound biomicroscopy was the primary imaging modality.

Main Results:

  • Comparing light to dark conditions, a significant angle decrease and iris thickness increase were observed.
  • Post-laser peripheral iridectomy, significant changes in iris-lens contact distance and iris-lens angle were noted under light/dark conditions.
  • Anterior chamber depth showed no significant changes throughout the study.

Conclusions:

  • A correlation exists between decreased angle and increased iris thickness.
  • Post-laser peripheral iridectomy, increased iris-lens contact distance and decreased iris-lens angle were observed.
  • The findings challenge the traditional theory of pupillary block as the sole mechanism for acute primary angle-closure.