Metropsis Visual Function Assessment


Precise tests of acuity, spatial and temporal contrast, colour and stereo vision

Metropsis is a complete test suite suitable for clinical, pre-clinical research, applied vision research, drug trials, screening, sports science and human factors research. The tests have been developed to investigate diseases of the eye and the brain, as well as changes in visual functions as a secondary effect of systemic disorders, such as cardiovascular diseases or neurological dysfunctions.

Guide Price: £13250

SKU: M0400

Achromatic temporal contrast sensitivity function

Measurements of temporal contrast sensitivity functions are obtained using standard psychophysical procedures and stimuli.

Metropsis provides accurate measurements of the observer's ability to see low contrast temporal stimuli, making it very suitable for assessing and monitoring eye diseases, such as age-related macular degeneration and glaucoma, or to evaluate visual functions of systemic disorders, such as cardiovascular or neurodegenerative diseases, and diabetes.

Default test protocols are preset and locked for quick and easy testing; however, the psychophysical and stimulus parameters are highly configurable, and can be unlocked for advanced users.

For advice on setting up your own protocols, please contact our Staff Scientist.

Temporal Contrast Sensitivity Function (TCSF)

The TCSF protocol measures temporal contrast sensitivity using a Gaussian blob target presented in the centre of the screen.

In the default protocol, temporal contrast sensitivity is measured across 10 temporal frequencies. For each temporal frequency, the testmeasures the minimum amount fo contrast required to detect the flicker.

The target consists of a Gaussian blob, presented in the centre of the screen. In each trail the may be either steady, or flickering.


The observer’s task consists in responding whether the target was flickering or not by pressing the left-hand side button of the response box if it was flickering or the right button if it was steady.

The test lasts approximately 25 minutes. When the experiment is complete, the data are plotted and fit as a graph of contrast sensitivity function.


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