Adaptation time, electroretinography, and pupillography in healthy subjects
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To investigate the relationship between adaptation time and the parameters of electroretinography (ERG) and pupillography in healthy subjects.
Forty-six eyes of 23 healthy women (mean age 21.7 years) were enrolled. ERG and pupillography were tested in each of the right and left 23 eyes, respectively. ERG with a skin electrode was used to determine amplitude and implicit time by the records of rod-, flash-, cone-, and flicker-responses with white light (0.01–30 cd s/m2). Infrared pupillography was used to record the pupillary light reflex to 1-s stimulation of red light (100 cd/m2). Cone- and flicker- (rod-, flash- and pupil) responses were recorded after light (dark) adaptation at 1, 5, 10, 15, and 20 min.
Amplitude (µV) was significantly different between 1 min and ≥ 5 or ≥ 10 min after adaptation in b-wave of cone- or rod-response, respectively. Implicit time (ms) differed significantly between 1 min and ≥ 5 min after adaptation with b-wave of cone- and rod-response. There were significant differences between 1 min and ≥ 10 or ≥ 5 min after dark adaptation in parameter of minimum pupil diameter (mm) or constriction rate (%), respectively.
Cone-driven ERG can be recorded, even in 5 min of light adaptation time without any special light condition, whereas rod-driven ERG and pupillary response results can be obtained in 10 min or longer of dark adaptation time in complete darkness.
KeywordsLight adaptation Dark adaptation Adaptation time Electroretinography Pupillary response
The authors thank Yuuki Nakayama, Yousuke Horiuchi of Uni-hite corporation, for technical assistance with data collection; Robert E. Brandt, Founder, CEO, and CME, of MedEd Japan, for editing and formatting the manuscript. This study was supported by a grant from Kitasato University School of Allied Health Sciences Grant in-Aid for Research Project, Grant Number 2018-1041.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflicts of interest.
Statement of human rights
All research procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all subjects in this study.
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