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Official Journal of the Japan Wood Research Society

Table 1 Test procedure

From: Reducing eye fatigue through the use of wood

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

  1. The order of presentation of three target materials was randomized
  2. NPD near-point distance