Summary. Someone working at a desk job all day may want to consider having multiple prescriptions: one for close-up work and one to be used when driving or wanting to see distant objects with exceptional clarity.
If someone sees well close up (nearsightedness), but can’t see things far away, their prescription will attempt to bring distant objects into focus without hindering visibility of near objects. However, this usually isn’t perfect.
Most people who are near sighted remove their glasses when reading, or they may have a weak distant prescription for contacts so as not to strain their vision when looking at close objects. This is where multiple prescriptions can help.
An alternative would be a multifocal contact lens like the Alcon CibaVision Air Optix Aqua Breathable Contact Lenses.
Video. The video below, originally posted on 25 June 2010, discusses some of the benefits to having multiple prescriptions.