Resolution depends on the quality of the objective lens. If you use high power eye-piece on a image made by low resolution objective lens, blur will just be enlarged and will see nothing. Field Virtual image of objective lens will be made just in front of the eye-piece. Eye-piece is designed to enlarge this virtual image. Normal eye-piece has field of 10 to 12.
Microscopes designed for super wide field has bigger tube.
You will not have to put your eyes too close to the lens. People who wear glasses probably think this is more convenient because you don't have to take off your glasses for the observation. In some microscopes, aberration are corrected by combination of objective lens and the eye-piece, so it is best to buy both lens from same company.