The video sequence shows that right eye closure is effective in PPR control, whereas left eye closure is relatively ineffective. This is evident if eye closure is performed at the start or during IPS.
Five different types of lenses are tested in a young girl with Janz Syndrome, comparing a special lens (Z1) with four (three blue and one brown) different commercial lens types. The first IPS is performed without a lens, the second, third and fourth with blue lenses, the fifth with a brown lens, and the sixth with a Z1 lens. Complete effectiveness is shown only with a Z1 lens. The first and sixth IPSs have the same frequency.
A young girl presents with typical absence seizures with mild clonic manifestations during IPS. If IPS is performed in a light room, as shown in the video, absence does not occur.
A five-year-old girl presents with typical absence seizures during IPS, but, unlike those of Case 3, only when IPS is performed in a light room.
A positive IPS response was obtained in an adolescent girl with JME soon after awakening (note the time of recording). IPS was ineffective when performed during afternoon EEG.
IPS is performed when the patient is holding his arms in the Mingazzini I position. Note the myoclonic-atonic phenomenon responsible for dropping the object which was in his hand.
The lamp for IPS is positioned at a distance of 30 cm from the nasion. The room is in darkness to demonstrate the correct distance.