Notch in contrast sensitivity function of optical origin: diffraction effects of acrylic filters.
A series of retinal image degrading filters was evaluated by measuring the contrast sensitivity function of four human subjects through the filters (residual CSF). The acrylic filters, with regularly spaced cross-hatches, produced progressively more reduction in the residual CSF as the density of the cross hatching increased. For some of the filters there was a selective loss of a narrow band of spatial frequencies as a result of diffraction effects. This experiment serves to further emphasize the need to rule out optical causes of such notches in the CSF before making a diagnosis of neurological dysfunction.
Irving
E L
EL
School of Optometry, University of Waterloo, Ontario, Canada.
Woo
G C
GC
Charman
W N
WN
D000180:Acrylic Resins; D000328:Adult; D015350:Contrast Sensitivity / Q000502:physiology*; D005374:Filtration; D006801:Humans; D010364:Pattern Recognition, Visual / Q000502:physiology; D012542:Scattering, Radiation; D012684:Sensory Thresholds / Q000502:physiology
D000180:Acrylic Resins