Neutral Density Bars are used to measure Afferent
Pupillary Defects (APD) also called 'diminished pupil reaction to light levels'.
The log units quantify how much light is transmitted as: 41%, 22%, 12%, 7%, 5%,
and 3%.
The NEW Richmond Products Neutral Density Bar (P/N 4702)
provides twice the frame size for easier exams. It provides the same filter
values: 0.3, 0.6, 0.9, 1.2, 1.5, 1.8 Density Log Units. The larger frame size
was requested by several Neuro Ophthalmologists. The overall bar is 10" by
1 ½" (253mm by 38mm). Each frame is 1 ½" (38mm) square. This unit
employs solid color blocks to prevent any dust from collecting between the
layers. It comes with a handle for easy use and hole for storage.
4702R Neutral Density Filter Bar -
Large Frame (1 lb) .......... $100.00
4888 Slider adds 1.8 density to filter
bar .................................. $20.00
Neutral Density Bar
- Short
Neutral Density Bar -
Pocket Size
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