Neutral Density Bar: Large with Filter Slider

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The Neutral Density Filter Bar allows to easily measure afferent pupillary defects (APD) also called “diminished pupil reaction to light levels”. Provides the filter values: 0.3, 0 .6, 0.9, 1.2, 1.5, 1.8 Density Log Units. Each filter is 1.5" (38 mm) square with an overall bar size of 10" by 1.5" (25.3 cm by 3.8 cm). Comes with a handle for easy use and a case for storage. Slider not included. Show more