A method of detecting constriction of the pupils includes: registering one or more motion illusion pattern images or one or more luminance values of the one or more motion illusion pattern images, the one or more motion illusion pattern images including a first motion illusion pattern image which had caused motion illusion to a specific user displaying the registered one or more motion illusion pattern images or one or more motion illusion pattern images created based on the registered one or more luminance values on a display device and determining whether the motion illusion is occurred to the specific user based on the displaying.
