A reason why we might see in the visible region of the electromagnetic spectrum is that it is close to the peak emission of the sun so it makes it easier to see objects.

Another reason may be due to evolution. Life originally began in water. The visible spectrum just happens to be pretty transmissive in water so fish and other animals can see better in the water. Water typically absorbs much more in other regions of the spectrum.

Can you provide additional comments on the statements above?