Why wasn't the art technique of perspective used during the middle ages?

Perspective art technique is not widely used during the Middle Ages because only limited artist has a thorough commitment to the principle of central convergence to achieved vanishing point. Although there are various drawings and paintings that show amateur attempts to perspective technique, many artist still use parallel lines and non-parallel line without a single vanishing point and this central vanishing point is use to evaluate perspective accuracy.

Iwould say overhead, b/c front would shine in their face, and might mess up the picture, especially if taken by a so either front or overhead, but i'm leaning towards overhead

Where are the choices?