According to your statement, I think you had better choose the Multifocal contact lenses. As we all know, when we get some certain years, especially our father, they can not see distance clearly, and I have asked eye doctor for help because of my grandpa, at that time, the Multifocal contacts are the first choice. As to the contact lenses, following is the theory. Multifocal lenses fall into two design categories: aspheric and segmented translating. On aspheric lenses, the center is reserved for distance viewing. The patient sees near, far and intermediate distances simultaneously. It's up to the brain to select the proper image. This focal pattern is often referred to as a ''bull’s eye'' design.