The physiologic characteristics of relative pupillary block

D. R. Anderson, Chi Jin Jai Chi Jin, M. M. Wright

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


In biometric photographs of 13 patients, we quantified the iris contour in eyes with central anterior chamber depths ranging from 1.9 to 3.4 mm (epithelium to lens surface). This actual profile was compared to that predicted by a theoretical analysis of the forces acting on the iris. The average discrepancy between the calculated actual and the theoretically predicted iris position was only -0.01 to +0.03 mm. The close agreement validates the model under normal conditions and in the presence of relative (nonsynechial) pupillary block. The theoretical iris shape may not occur under conditions that violate the underlying physical assumptions of the mathematical model, such as when iridectomy eliminates the pressure difference between the anterior and posterior chamber or when synechiae introduce additional forces on the iris other than the ones included in the analysis.

Original languageEnglish (US)
Pages (from-to)344-350
Number of pages7
JournalAmerican journal of ophthalmology
Issue number3
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology


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