Photos: 10 cool virtual reality patents from the past 25 years

Optical system for virtual reality helmet

The patent for this virtual reality helmet was filed in 1993. The patent summary describes an improved field of view and image quality (compared to what, it doesn't say), adjustable lenses, and a second set of lenses.

By Erin Carson

Erin Carson is a Staff Reporter for CNET and a former Multimedia Editor for TechRepublic.