perimetry
noun
                                                                                                                            
                                                            pe·rim·e·try
                    
                                                                                                              
                                                                                                                                  pə-ˈrim-ə-trē  
                                                      
                                                          
            
            
               plural perimetries            
        
    
                                
              
          
                                                      : examination of the eye by means of a perimeter                                      
                
                    
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  Merriam-Webster unabridged




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