Visual fatigue during control room work in process industries.

Background: Working in front of computer screens is visually demanding and related to adverse eye symptoms. Occurrence of glare further increases visual fatigue.

Objective: This paper presents results from an examination of visual ergonomics in control room environments at two Swedish process industries.

Effect of 3-Dimensional Central Stimuli on Near Point of Convergence.

Aim: Since an interaction between binocular disparity and the vergence system takes place in order to reduce retinal disparity, it is likely that vergence control, as measured with the near point of convergence (NPC), will be better if the target used for measurement has 3-dimensional (3-D) features in its most central parts. The aim of the present study was therefore to investigate if the NPC would give a better result using a fixation target with centrally placed 3-D features when compared with a two-dimensional (2-D) target.

Methods: Twenty-three asymptomatic subjects (2 men, 21 women; average age 30.

Vision, light and aging: a literature overview on older-age workers.

Background: In many western countries individuals will need to continue their professional careers beyond the current retirement age. This requires adaptation of the working conditions to compensate for age related visual changes.

Objective: The aim of this paper is to compile and structure knowledge concerning age related changes in visual and non-visual functions among older-age workers and to describe in what way these changes relate to light and work performance.

The effect of glare on eye movements when reading.

Background: Glare is a very common source of image degradation when performing computer work. Since reading is a task that is very sensitive to image degradation induced disability glare affects reading performance.

Objective: To assess the effect of different glare conditions on eye movements when reading on a computer screen.

Measuring glare induced visual fatigue by fixation disparity variation.

Objective: To introduce fixation disparity variance as an objective measure of visual discomfort. A higher variance in fixation disparity is indicative of more visual fatigue. This observation is based on the results from a study where we investigated how fixation disparity was affected by glare on a VDU.