Observation distance and blinking rate measurement during on-site investigation: new electronic equipment

Modern work activities often require an intense and prolonged visual effort on near objects. At the same time, occupational asthenopia caused by accom modation and binocularity overloading is a very common complaint in these w orking populations. Moreover, blinking rate seems to be a sensitive paramet er with 'indoor-near-work operators', possibly increased by both chemical a nd physical environmental agents and decreased by cognitive effort. In this paper, a new piece of electronic equipment used to measure the observation distance and blinking rate is described.