http://www.guldenophthalmics.com/ccp7/Farnsworth-Dichotomous-D15-Test - Gulden Ophthalmics offers a variety of Occluders, Maddox rods and Red Lenses. The entire Gulden occluder family is molded from strong, lightweight ABS plastic, with an easy cleaning gloss finish. Occluders are available in black or white, and have a standard length of 25cm.
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