Contact lenses are not permitted for near vision only since you will lose the ability to focus in the distance. This mainly affects people aged over 40.
A pre-presbyope has the ability to focus in the distance, near and intermediate and therefore will not have any problems. A presbyope (difficulty with near vision) struggles to adjust there vision for near. By using contact lenses JUST for near, the instrument panel will look nice an clear but the pilot will stuggle to see the runway.
I hope this helps