What is "irisvision"

IrisVision was an expansion card developed by Silicon Graphics for IBM compatible PCs in 1991 and was one of the first 3D accelerator cards available for the high-end PC market. IrisVision was actually an adaptation of the graphics pipeline found in the Personal IRIS workstation to the Micro Channel architecture and consumer ISA buses found on most modern PCs of the day. It is also notable for being the first time that any variant of IRIS GL was ever ported to the PC (an experience that subsequently led to the creation of the OpenGL API).