3D printing of multimaterial objects is an emerging field with promising applications. The layer-by-layer material addition technique used in 3D printing enables incorporation of distinct functionalized materials into the specialized devices. However, very few studies have been performed on the usage of multimaterial 3D printing for printable photonic and
wearable devices. Here, we employ vat photopolymerization-based 3D printing to produce multimaterial
contact lenses, offering enhanced multiband optical filtration, which can be valuable for tackling ocular conditions such as
color blindness. A combination of
hydroxyethyl methacrylate (
HEMA) and
polyethylene glycol diacrylate (PEGDA) was used as the base
hydrogel for 3D printing. Atto565 and Atto488
dyes were added to the
hydrogel for wavelength filtering, each
dye suitable for a different type of
color blindness. Multimaterial disks and
contact lenses, with separate sections containing distinct
dyes, were 3D-printed, and their optical properties were studied. The characteristics of multimaterial printing were analyzed, focusing on the formation of a uniform multimaterial interface. In addition, a novel technique was developed for printing multiple dyed materials in complex lateral geometrical patterns, by employing suitable variations in CAD models and the UV curing time. It was observed that the multimaterial printing process does not negatively affect the optical properties of the
contact lenses. The printed multimaterial
contact lenses offered a combined multi-band
color blindness correction due to the two
dyes used. The resulting optical spectrum was a close match to the commercially available
color blindness correction glasses.