"Special lenses" refers to eyeglasses or contact lenses that are designed to correct specific vision problems or enhance certain visual abilities. Full definition
Special lenses on the display create discrete images for the driver's left and right eyes, while a camera automatically adjust the display so the «perfect» 3D image is always shown. (automobilemag.com)
That's a big difference from some existing VR headsets, such as the Samsung Gear and Google's own previous headset, which are basically fancy cases with special lenses that a user slides a phone into. (businessinsider.my)
Ultra-short throw projectors use special lenses so they can be mounted only inches from the presentation, Jakob says, which means they are ideal for interactive presentations as there is no risk of projector light shining in the eyes of teacher or student. (educationmattersmag.com.au)