Official Journal of the Japan Wood Research Society
Before test | Give test subjects an overview of examination and obtain their consent |
Practice measuring NPD using a near-point ruler | |
First test | (1) Subjective symptoms investigation of eyes and head before gaze |
(2) NPD measurement before gaze | |
(3) Gaze at target material (30 min) | |
(4) NPD measurement after gaze | |
(5) Subjective symptoms investigation of eyes and head after gaze | |
Pause | 2-h break or resume another day |
Second test | (1)–(5) above examined for another target material |
Pause | 2-h break or resume another day |
Third test | (1)–(5) above examined for the final target material |
Rank three target materials for visual contact by degree of eye fatigue and headaches they produce |