We conducted a user test with 27 participants (14 female, 13 male). Their age varied from 19 to 54 years (average age 26 years), and 12/27 wore spectacles. None had experience with S3D mobile phones, but 2/27 had used a 3D camera and 24/27 had experience of 3D movies. Before the actual study we ran a pilot study with two participants to refine the test procedure.