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Researchers develop a halometer that tests alterations in night vision
Date:3/24/2011

The test is performed under low-light conditions (in a dark room) and, before the test, patients are given some minutes to adapt to darkness.

This test involves showing a bright light stimulus to the subject against a dark background and, progessively showing different peripheral light stimuli with lower brightness around the central (Figure 2), at random, in different positions and at different distances. Subjects' task is to press the buttom of a mouse every time they detect a peripheral stimulus. Once the test ends, the software makes an estimation of a parameter named "Visual Disturbance Index" that, together with the results graphic, determines the type and intensity of visual disturbance.

This index scores from 0 to 1, so the higher is this index, the stronger is the influence of the halo or any other visual disturbance perceived by the observer. Therefore, the lower is the subject's ability to detect the peripheral stimuli displayed around the main stimulus that causes such disturbances.

One of the advantages of the halometer developed at the University of Granada is that it allows to configure such test parameters as:

  • Special parameters: the radius of the central stimulus and the peripheral stimuli can be modified. Furthermore, the number of semi-major axes where the peripheral stimuli will be displayed can be fixed, as well as the maximum radius maximum distance between these stimuli-, and the number of stimuli per semi-major axe.

  • Temporary Parameters: the software allows to set some exposure time for adaptation to darkness and to the brightness of the central stimulus. Furthermore, others parameters as the exposure time to the stimulus and the time elapsed between a stimulus and the next one can also be set.

  • The software also allows to set the color and brightness of central and peripheral stimuli, and the weight and number of times each peripheral stimulus is shown.

This test has
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Contact: Jos Juan Castro
jjcastro@ugr.es
34-958-241-902
University of Granada
Source:Eurekalert  

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Researchers develop a halometer that tests alterations in night vision
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