【 Multi-focus Reading Glasses】Intelligent progressive multifocal Lens Give the best experience. Multifocus Reading Glasses feature three strengths in one pair of reading glasses so you can read, work on your computer and interact with others without having to take your glasses off. As it is a pair of progressive multifocal glasses, so generally speaking, you need about a week of adaptation.but the adaptation period varies from person to person, walk slower when feel dizzy