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. Author manuscript; available in PMC: 2009 Aug 1.
Published in final edited form as: J AAPOS. 2008 May 2;12(4):365–369. doi: 10.1016/j.jaapos.2008.01.017

Figure. Near hole-in-the-card test.

Figure

This test was based on the design of the distance hole-in-the-card test. (A) A 25 mm × 150 mm Falcon® polyethylene culture dish was used (BD Biosciences, San Jose, CA). (B) A 30 mm black square with a 1.5 mm square opening was attached to the front of the culture dish centered over a letter (1 mm in height and width) that was fixed to a white background inside the dish. (C) The apparatus was attached to a reading stand to allow the proper viewing angle. (D) The near-hole-in-the-card test is shown in use.