Fig. 2From: Controllable liquid colour-changing lenses with microfluidic channels for vision protection, camouflage and optical filtering based on soft lithography fabricationFabrication of the liquid colour-changing lens with microfluidic channels. a Fabrication of the PDMS film with microfluidic channels. b Bonding process of the PDMS film with different substrate lenses (glass/optical resin CR39)Back to article page