Contrast sensitivity testing has been recommended as a natural addition to current optometric acuity and field measurements. Unfortunately there have been no clinical studies comparing the available instrumentation. This study compared the Arden plates versus the Nicolet CS2000. The instruments were evaluated in terms of their discriminatory capability to detect a selective frequency or notch contrast threshold elevation . The hypothesis is that the two instruments would produce contrasting CSF curves that reflect the different purposes of their designs. It was found that the Nicolet CS2000 discriminated a focal visual disruption more clearly than the Arden plates, which tended to detect all disturbances as generalized elevations of threshold values. The lack of standard psychophysical and psychometric procedures to produce normative data is a serious limitation of current CSF testing. In addition the overlap of normal and abnormal values reduces the usefulness of current contrast sensitivity instrumentation to contribute to differential diagnosis of visual loss.
Files are restricted to Pacific University. Sign in to view.