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      Spatial contrast sensitivity functions (CSFs) depict the relationship between the contrast threshold for detection and the spatial frequency of the grating. Similarly,  temporal CSFs show the change of the contrast threshold with the flicker frequency. The two types of CSFs are interacted each other. You can enter the spatial frequency, temporal frequency, and mean luminance level of a grating to estimate the corresponding contrast threshold based on a chosen data set.  The estimated thresholds based on the model equation can differ from actual data.  The amount of deviation can be seen from the differences between the calculated thresholds (smooth curves) and the experimental data (circles) in the displayed figure.


You need to log in  to access the combined  baseline data, where the model parameter values  are the means optimized over several published studies. If you do not have a user name, please register here.

Choose a data set as the baseline:

Enter grating variables:
Spatial Frequency (cpd):      
Temporal Frequency (Hz):   
Mean Luminance (cd/m2):    
Field Size (degree):              

Contrast Threshold: 

Contrast sensitivity graph
Contrast threshold data were obtained from Kelly (1972, Fig. 7), where the mean luminance was about 8.7 (cyan), 27.5 (red), 86.7 (green), and 275 (blue) cd/m2, respectively. Field size was 7 degrees, monocular viewing, with artificial pupil 2.3 mm. Smooth curves are current model fits to this data set.