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Introduction to Visual Acuity Measurement
#Colenbrander#Low Contrast#Low Vision#Reading#Visual Acuity
May 23, 2025

Introduction to Visual Acuity Measurement

by August Colenbrander, MD – San Francisco Since the 1970’s Precision Vision has built a reputation of producing the most ...


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Your patients, practice & research deserve a REAL Logarithmic Chart!

REAL Products You Can Trust.

What makes charts like this counterfeit?

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These are not acceptable alternatives to the ETDRS Standard Optotypes. At least one of these charts above has 8+ confirmed inaccuracies in it.

In reviewing these charts, some of the most telling of the issues were:

  • Spacing & Sizing is inconsistent and inaccurate
  • These charts are unclaimed charts without Manufacturer or Reseller Information
  • The optotype set is inaccurate

These charts should not be confused with charts approved for research and clinical trials. These charts will not meet FDA, NEI, NIH requirements for visual acuity charts.

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Counterfeit Product Information

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