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Used to 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, and 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 case for storage.
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