Environmental Engineering Reference
In-Depth Information
(c)
Fig. 8. (a) Level of eyestrain symptom (b) Level of blurred vision symptoms (c) Level of dry
and irritated eyes symptoms
experienced by most users (75%) for all condition of contrast. While blurred vision was
experienced by 63% of the users at -50.83% contrast ratios and dry and irritated eyes was
experienced by 50% of the users at 0% (-0.56%) contrast ratios. This is due to the contrast
condition affecting the ability of the eyes to distinguish the target from the background.
Thus the contrast ratio should be considered as one of the attributes or variables in
designing a virtual environment.
5. Conclusion
It can be concluded that:
1.
The design of a virtual environment design is influenced by several attributes such as
colour background, virtual lighting, field of view, flow rate, speed of virtual object,
resolution of display and contrast ratio. These attributes significantly affect users
particularly with eyestrain symptoms.
2.
Blurred vision symptoms are significantly affected by several attributes of the VE
design i.e. the red colour of the background, the field of view (FOV), the flow rate at ten
seconds per piece (FR10), the speed of virtual object motion, and the contrast ratio at -
50.83%.
3.
Dry and irritated eyes symptoms are also significantly affected by several attributes of
the VE design i.e. the virtual lighting at 10% and 100% levels of brightness, field of view
(FOV) for all conditions, flow rate (FR) for all conditions, the speed of virtual motion for
all speeds, the resolution of CRT screen at medium and low resolution and a contras
ratio of 0%.
