Related Experiment Videos
Anomaloscope examination: scotopization (the luminance fall)
1Department of Ophthalmology, St. Radboudziekenhuis, Nijmegen, The Netherlands.
Purpose:
The evaluation of a criterion for the detection of pathologic scotopization in routine anomaloscope examination.
Methods:
Fifty congenital protan subjects, 50 congenital deutan subjects, 30 autosomal recessive congenital achromats, and 25 (44 eyes) acquired type I red-green defective subjects were selected. The anomaloscope examination was according to the Linksz procedure. The luminance fall was calculated as the slope quotient SQ: Y units luminance fall per X units width of the matching range.
Results:
The mean SQ was -0.01 for congenital deutan subjects, -0.40 for congenital protan subjects and -1.30 for congenital achromats. There was no overlap between the three groups. Pathologic scotopization was found in 98% of the eyes presenting with an acquired type I colour vision defect.
Conclusion:
Calculation of the slope quotient SQ is helpful for the detection of pathologic scotopization in acquired colour vision deficiency.