Premium
Continuous recording of accommodation and pupil size using the Shin‐Nippon SRW‐5000 autorefractor
Author(s) -
Wolffsohn J. S.,
Gilmartin B.,
Mallen E. A. H.,
Tsujimura S.
Publication year - 2001
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.2001.00586.x
Subject(s) - autorefractor , accommodation , pupil , optics , optometry , physics , mathematics , refractive error , medicine , visual acuity
Summary 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 1 min using digital image analysis of the reflected retinal image of a measurement ring. Continuous on‐line analysis of the ring provides high (up to 60 Hz) temporal resolution of the refractive state to an accuracy of <0.001 D. Pupil size can also be analysed to a resolution of <0.001 mm. The measurement of accommodation and pupil size was relatively unaffected by eccentricity of viewing up to ±10° and instrument focusing inaccuracies of ±5 mm. The resolution properties of the analysis are shown to be ideal for measurement of dynamic accommodation and pupil responses.