Christmas VR

Use Google cardboard or similar device.
Immerse themselves in virtual reality helps smartphone with more than 400 ppi.

Should immediately stop viewing stereoscopic images, and consult a doctor if you have marked at least one of the following symptoms: impaired vision, headache, dizziness, involuntary muscle twitching eyelids, inability to concentrate, nausea, unconsciousness, convulsions, cramps, disorientation