https://wccftech.com/ns-glasses-nintendo-switch-passive-3d/

The Nintendo Switch now has its first “passive 3D” headset lined up for release. Called NS Glasses, it’s based on color switching technology and compatible with all existing Nintendo Switch games. The device also features a “pixel smoothing” effect which should help with the low resolution (usually 720p) used by the Nintendo Switch in handheld mode. It’s being developed by exklim, the Canadian startup behind the failed eX Core Kickstarter campaign for a portable external graphics docks.

NS Glasses – 3D Headset for Nintendo Switch ?