photoreception
noun
                                                                                                                            
                                                            pho·to·re·cep·tion
                    
                                                                                                              
                                                                                                                                  ˌfō-tō-ri-ˈsep-shən  
                                                      
                                                          
            
                                
              
          
                                                      : perception of waves in the range of visible light                                      
                
                                
            specifically                
          
                                                      : vision                                      
            
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  Merriam-Webster unabridged




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