Hi, Is there a scientific name for this? I would like to be able to do more research on why I must turn head sideways to focus in multifocal lenses. I have tried proclear compatibles multifocals, and frequency 55 multifocals and I must turn my head one direction to focus clearly for near, and the opposite direction to focus clearly for far. Any suggestions? I have also tried acuvue bifocal and it focuses straight ahead , but must refocus with each blink. At this time, I am wearing the acuvue oasys in the left eye and nothing in the right, and would like to be able to wear a bifocal lens in the right. Thanks, Chipster