Functional Assessment - Visual Acuity

Visual acuity is a mainstay for the assessment of “How the EYE functions”.  Traditional, non-logarithmic, visual acuity charts, however, are inaccurate for visual acuities worse than 20/100.     Dr. Colenbrander developed a logarithmic Low Vision letter chart for use at 1 meter, which extends accurate measurement to 1/50 (20/1000).  With it, he developed guidelines for a systematic Low Vision evaluation.

             The Basic Low Vision Exam.     PDF

             The Historical Evolution of Visual Acuity Measurement.  August Colenbrander.  Visual Impairment Research 10(2,3):57-66 (2008).    PDF 

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