It is a common issue that you may experience blurriness or distortion with new prescription glasses. It is your eyes getting used to your new glasses and can lead to temporary discomfort. Relax. One or two-week adjustment would get you a clear and perfect vision. One more week for the multifocal lens are necessary.
Besides, if you start to wear progressive lenses or bifocals for the first time, you may need to learn how to focus your vision through the multifocal lens as well.
Bifocals have two fields of vision: the upper for distance and the lower for up close. 
Progressive lenses have three fields of vision and tend to be blurry on the sides of the lens. You see far away through the upper lens and up close through the lower. The intermediate-range of the lens facilitates a change in lens strength, and it is for seeing your laptop or something in the range of 20 inches to 40 inches (50 cm - 100cm) away from your eyes.
*Click here to know how to adjust to single vision glasses.
*Click here to know how to adjust to multifocal glasses.