The present invention relates to ionic silicone hydrogel polymers displaying improved lysozyme uptake, low contact angle and reduced water soluble polymeric ammonium salt uptake. An N\u2212 type semiconductor layer is formed on a front surface of a semiconductor substrate, and a P type semiconductor layer is formed thereon. Short range and inexpensive sensors are deployed for tracking the position of the user’s head; these sensors are deployed partly on a on the user’s head and partly on the tracking frame. The nanotube suspension is acidified to protonate a fraction of the nanotubes.