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Results 1 - 2 of 2 for Protan defect
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  1. ClinicalTrials.gov: Color Vision Defects From the National Institutes of Health (National Institutes of Health)  
    Color Blindness/Clinical Trials ... Color Blindness ... National Institutes of Health ... From the National Institutes of Health
  2. What Is Color Blindness? (American Academy of Ophthalmology)  
    Color Blindness/Start Here ... Color Blindness ... American Academy of Ophthalmology ... Color blindness occurs when you are unable to see colors in a normal way. It ...