Design Eye Position
Encyclopedia
In the design of human-machine user interfaces
(HMIs or UIs), the Design Eye Position (DEP) is the position from which the user is intended to view the workstation
for an optimal view of the visual interface. The Design Eye Position represents the ideal but notional location of the operator's view and is usually expressed as a monocular point mid-way between the pupils of the average user. The DEP may also allow for a standardisation of monocular and binocular "Field of View" and may be integrated into the CAD/CAM design system used to define the workstation build .
The DEP is particularly important in those operator workstations, such as the cockpit
of a military fast jet, where an accurate reading of information and symbols on displays may be critical. When designing such user interfaces the DEP is used as the reference point for the location of items (e.g. displays or controls) within the interface.
Pilots who are below or above the 50% percentile point for sitting height, i.e. not of average stature, may need to adjust the seat in order to attain the DEP, even if this means compromising their optimal reach envelope. This is why, for example, rudder pedals may need to be adjustable.
User interface
The user interface, in the industrial design field of human–machine interaction, is the space where interaction between humans and machines occurs. The goal of interaction between a human and a machine at the user interface is effective operation and control of the machine, and feedback from the...
(HMIs or UIs), the Design Eye Position (DEP) is the position from which the user is intended to view the workstation
Workstation
A workstation is a high-end microcomputer designed for technical or scientific applications. Intended primarily to be used by one person at a time, they are commonly connected to a local area network and run multi-user operating systems...
for an optimal view of the visual interface. The Design Eye Position represents the ideal but notional location of the operator's view and is usually expressed as a monocular point mid-way between the pupils of the average user. The DEP may also allow for a standardisation of monocular and binocular "Field of View" and may be integrated into the CAD/CAM design system used to define the workstation build .
The DEP is particularly important in those operator workstations, such as the cockpit
Cockpit
A cockpit or flight deck is the area, usually near the front of an aircraft, from which a pilot controls the aircraft. Most modern cockpits are enclosed, except on some small aircraft, and cockpits on large airliners are also physically separated from the cabin...
of a military fast jet, where an accurate reading of information and symbols on displays may be critical. When designing such user interfaces the DEP is used as the reference point for the location of items (e.g. displays or controls) within the interface.
Military Aviation
With collimated displays, such of the cockpit Head Up Display, the projected symbology is aligned very precisely with the outside world to allow for precise delivery of weapons and also for safe landing. Unless located at the Design Eye Position the pilot cannot see the symbology as it is effectively focussed at infinity. Similarly, Head Down Displays will usually be angled precisely towards the DEP so that all symbols may be equally visible to the pilot without parallax or other display distortion errors.Pilots who are below or above the 50% percentile point for sitting height, i.e. not of average stature, may need to adjust the seat in order to attain the DEP, even if this means compromising their optimal reach envelope. This is why, for example, rudder pedals may need to be adjustable.