Continuous recording of accommodation and pupil size using the Shin-Nippon SRW-5000 autorefractor

J.S. Wolffsohn, B. Gilmartin*, E.A.H. Mallen, S. Tsujimura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A newly released commercial autorefractor, the Shin-Nippon SRW-5000 (Japan), has been found to be valid compared to subjective refraction and repeatable over a wide prescription range. Its binocular open field-of-view allows the accommodative state to be monitored while a natural environment is viewed. In conventional static mode, the device can take up to 45 readings in 1min using digital image analysis of the reflected retinal image of a measurement ring. Continuous on-line analysis of the ring provides high (up to 60Hz) temporal resolution of the refractive state to an accuracy of <0.001D. Pupil size can also be analysed to a resolution of <0.001mm. The measurement of accommodation and pupil size was relatively unaffected by eccentricity of viewing up to ±10° and instrument focusing inaccuracies of ±5mm. The resolution properties of the analysis are shown to be ideal for measurement of dynamic accommodation and pupil responses. Copyright © 2001 The College of Optometrists.

Original languageEnglish
Pages (from-to)108-113
Number of pages6
JournalOphthalmic and Physiological Optics
Issue number2
Publication statusPublished - Mar 2001


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