Why do you need a prisim in your glasses why does one eye see higher or lower than the other what is this condition called?

A prism in glasses is used to correct misalignment of the eyes, a condition known as strabismus or heterophoria, where one eye may see higher or lower than the other. This misalignment can lead to double vision or difficulties in depth perception. The prism helps realign the light entering the eyes, allowing for clearer vision and better coordination between the eyes. By bending the light, prisms help the brain merge the images from both eyes into a single, coherent image.