It is an application that synthesizes the animation of the head position with the nystagmus image using the motion sensor built in the iPhone.
If you use the front camera, you can shoot your own nystagmus with just your iPhone. In the case of the front camera, the screen is used as lighting.
With a back camera and an iPhone fixture, you can shoot nystagmus images without shaking. Fix the iPhone in front of the eyeball and record the nystagmus. You can keep the settings such as LED brightness and focal length. You can set the LED to the lowest brightness, but it's still too bright on some models. In that case, cover the LED with a blank sheet of paper and adjust the amount of light.
The videos are listed by the year, month, day, hour, minute, and second when they were shot. Tap to play. You can delete it by swiping to the left. For videos, create an album called iCap NYS and save it in it.