A contrast sensitivity assessment consists of presenting the observer with a sine wave grating target of a given spatial frequency. The contrast of the target grating is then varied while the observers contrast detection threshold is determined. This use of sine wave gratings was first introduced in vision by Schade (1956) and was subsequently used by early investigators to measure basic visual sensitivity (Campbell and Robson, 1968). .
Contrast sensitivity testing complements and extends the assessment of visual function provided by simple acuity tests. Contrast sensitivity measurements offer information about an individuals ability to see low contrast targets over an extended range of target size and orientation.
Modern vision research has clearly demonstrated that the capacity to detect and identify spatial form varies widely as a function of target size, contrast, and spatial orientation (Brad*censored*, Campbell & Atkinson, 1978).
Unlike traditional methods of measuring the CSF, a computer program Gabori Attack was proposed to test CSF. This program is presented as a video game with clear instructions. The task was to quickly squish "Gaboris" that slowly emerge, gradually increasing in contrast at a random position from the grey screen using mouse clicks.
Due to uncertainty of the position, spatial frequency, and reaction time delay, the computer game tends to underestimate contrast sensitivity http://vsoc.benkely.edu/vsoc. .
It is expected from details http://vision.psy.mq.edu.au/%7Epeterw/csfl.htm that the function will be shifted downward compared to other more rigorous methods. Therefore, it is hypothesised that it is possible to use an arcade game "Gabori Attack" to measure CSF however, we expect to reject the null hypothesis that the peak is less than 100. Additionally, due to methodic limitations the computer game is expected to be less accurate.
The human visual system is able to detect spatial frequencies up to about 60.
