Lubar BOBOVR Z3 Virtual Reality 3D Glasses Headset VR Box with Adjustable Lens and Strap for 4~6" Smartphones Iphone 6 Plus Samsung Note Galaxy 3d Movies Google Cardboard Very easy to adjust Pupil Distance (PD) and Focal Distance (FD) to get the best 3D immersive experience: one knob for PD, another two knobs for FD. Myopia less than 600 degree is ok to use this item without wearing glasses Lubar BOBO Z3 3D VR glass is an intelligent adjustable virtual reality helmet, it perfectly compatible with 4" to 6" smartphone Anti-fog design: there are cooling vents in the front and on the top, so you phone will not be foggy when using Built with soft PU leather face mask, very comfortable to wear Turn your smartphone into a virtual reality viewer