In dogs, certain drugs are known to disturb the precise organization of the crystals of the<unk> , thus compromising the dog's ability to see in low light. These drugs include ethambutol, macrolide antibiotics, dithizone, antimalarial medications, some receptor H2-antagonists, and cardiovascular agents. The disturbance "is attributed to the chelating action which removes zinc from the tapetal cells."
Tapetum lucidum
Corona radiata 
Stratum basale
Glia limitans
Stratum lucidum
Neuromatrix
Stratum spinosum
Habenular nuclei