HIGH DEFINITION LENSES
The power of a normal lens (diopters) is stronger on the side. The light that falls in on the side isn't sharp on the retina, but before it!
You don't have this problem with aspheric glasses and lenses.Even the light that falls in on the side, is sharp on the retina. Mainly at night, you will experience that those glasses are better (because your pupils are wide open): more contrast // less light sparkling ...
EXAMPLES OF ASPHERIC LENSES:
MONHTLY LENSES: Purevision
DAILY LENSES: Soflens dailies disposable
You can try these lenses noncommittal
BETTER SIGHT ... AT NIGHT !