Practical contrast sensitivity acuity testing.
A 2.0 neutral density (1% transmission) filter allows an easy, consistent and natural way of checking visual acuity on a low contrast Snellen test chart, and is particularly useful in documenting poor visual function in patients with certain types of cataract.
Drews
R C
RC
D002386:Cataract / Q000175:diagnosis; D015350:Contrast Sensitivity; D006801:Humans; D011379:Prognosis; D014787:Vision Tests; D014792:Visual Acuity