The VDU electronic line marker (1, 22) is coupled between a Visual Display Unit (23) and a computer/terminal (24, 25) combination and works independently of the software.

Separate particle monitors (1) record and store data, each having their own key-pad and visual display unit.

The VDU (10) and hand control (10) are mounted on a station which co-operates with, but is unattached to, a seat (13) and the VDU (8) may be displaced to allow easy entry into, and exit from, the seat.

Controls for each surveillance accessory (lights, cameras etc) are lead to a station having a single VDU (8) and a single hand control (10).

The first reports of skin complaints among people working with or near VDUs came from Norway as early as 1981.

Finally, results are displayed through the display terminal.

A sign-in method, system, scanning terminal, and display terminal based on two-dimensional code.

The input terminal (103) is connected directly to the server (101) through a mobile network (105), without going through the display terminal (102).

Work with visual display terminals: Psychosocial aspects and health.

The arrangement way is novel, and the functions of the display terminal are enriched; and furthermore, the icon required by the user can be conveniently found.

The VDT produces an image on the display screen responsive to the intensity input.

The apparatus uses a digital display screen accurately to represent a VDT used under actual work conditions.

The VDT has a display screen and a plurality of color channels, each color channel having an intensity input, a bias input, and a gain input.

A lens which can be worn, in the form of eyeglasses, for the reduction of visual noise and resulting eye strain for an observer of a visual display terminal.