phorometer
noun
                                                                                                                            
                                                            pho·rom·e·ter
                    
                                                                                                              
                                                                                                                                  fə-ˈräm-ət-ər  
                                                      
                                                          
            
                                
              
          
                                                      : an instrument for detecting and measuring imbalance in the extrinsic muscles of the eyes                                      
                
                    
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  Merriam-Webster unabridged




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