ABSTRACT
The toxic properties of chemical agents that might affect the eye and visual perception have long been recognized. Knowledge and characterization of the effects of industrial chemical agents and drugs on the eye and visual perception have been compiled in comprehensive sources since the 19th century. Horizontal cells change the polarization of the bipolar cells by modifying the receptor fields of a neuron. The receptor field is the area of the retina that, when stimulated, produces a change in the electrical activity of the neuron. The superior colliculus receives the input from the retina and from the visual cortex. The tectospinal tract is formed by axons that have their cells in the superior colliculus. There are five kinds of neurons that are present in the retina: receptor cells, bipolar cells, horizontal cells, amacrine cells, and ganglion cells. There are two types of receptor cells, rods and cones.
