Stimulation and recording of dynamic pupillary reflex: the IRIS technique Part 2

J. P.H. Reulen*, J. T. Marcus, M. J. van Gilst, D. Koops, J. E. Bos, G. Tiesinga, F. R. de Vries, K. Boshuizen

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


The paper describes a newly developed method, called IRIS, for the recording of dynamic pupillary reflexes simultaneously in both eyes. The method is based on the principle of reflection of infra-red light by the iris/pupil boundary. IRIS incorporates a head-fixed. Maxwellian viewing-light stimulator driven by a function generator. IRIS enables pupillary constriction and dilation to be recorded in response to a pulsed light stimulus, thereby permitting determination of the latency times of constriction and dilation. Furthermore, the recording of natural pupil oscillations, the hippus, is possible. IRIS incorporates a clamp-box mode, permitting the study of stimulus-induced pupil oscillations and pupil cycle time. The compact and portable IRIS pupil system combines reliable and accurate recording with general versatility and ease of operation.

Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalMedical & Biological Engineering & Computing
Issue number1
Publication statusPublished - 1 Jan 1988


  • Eye movements
  • Infra-red light
  • Light reflex
  • Pupil
  • Recording
  • Reflection


Dive into the research topics of 'Stimulation and recording of dynamic pupillary reflex: the IRIS technique Part 2'. Together they form a unique fingerprint.

Cite this