NEUTRAL DENSITY BAR

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POCKET SIZE

The Neutral Density Bar is used to measure Afferent Pupillary Defects (APD) which is defined as diminished pupil reaction to light levels. It uses six standard ND levels most useful for quantifying APD. The 'log unity' quantify how much ;light is transmitted through the filter. Includes six filters rated as 0.3, 0.6, 0.9, 1.2, 1.5, and 1.8 log unit optical density values. The 0.3 ND filter is most useful for uncovering a borderline pupil defect.

The patient sees a simmer image in the 'bad' eye. The Neutral Density bar is held in front of the 'good' eye, going up the log unit scale until both eyes see the same image brightness.

Fits in shirt pocket. Includes leather slip cover. Overall bar is 6 ½" x 1" (16.5cm long and 3 cm wide). Each filter measures 7/8" by 1" (2.5cm x 3 cm). 

The filter bar can be used in conjunction with the 'swinging flashlight' test to detect and quantify the depth of any afferent conduction defect.

15118   Pocket Size Neutral Density Bar .......... $59.90

Neutral Density Bar - Large Frame

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