New video pupillometer

Jay W. McLaren; Wayne H. Fjerstad; Anders B. Ness; Matthew D. Graham; Richard F. Brubaker M.D.

doi:10.1117/12.192238

1 March 1995 New video pupillometer

Jay W. McLaren, Wayne H. Fjerstad, Anders B. Ness, Matthew D. Graham, Richard F. Brubaker M.D.

Author Affiliations +

Optical Engineering, Vol. 34, Issue 3, (March 1995). https://doi.org/10.1117/12.192238

Abstract

An instrument is developed to measure pupil diameter from both eyes in the dark. Each eye is monitored with a small IR video camera and pupil diameters are calculated from the video signal at a rate of 60 Hz. A processing circuit, designed around a video digitizer, a digital logic circuit, and a microcomputer, extracts pupil diameter from each video frame in real time. This circuit also highlights the detected outline of the pupil on a monitored video image of each eye. Diameters are exported to a host computer that displays, graphs, analyzes, and stores them as pupillograms. The host computer controls pupil measurements and can turn on a yellow light emitting diode mounted just above each video camera to excite the pupillary light reflex. We present examples of pupillograms to illustrate how this instrument is used to measure the pupillary light reflex and pupil motility in the dark.

Citation Download Citation

Jay W. McLaren, Wayne H. Fjerstad, Anders B. Ness, Matthew D. Graham, and Richard F. Brubaker M.D. "New video pupillometer," Optical Engineering 34(3), (1 March 1995). https://doi.org/10.1117/12.192238

Published: 1 March 1995

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available