Abstract: Composite particles comprising a hydrophobic dye and an amphiphilic block copolymer encapsulating the dye are disclosed. The dye exhibits absorbance peaks at one or more points in the ultraviolet, visible, or infrared regions of the electromagnetic spectrum. The particles are thus useful in optical applications, such as the preparation of contact lenses that screen out harmful radiation. In select embodiments, the dye is Zinc (II) 5, 10, 15, 20-(tetraphenyl) porphyrin and the copolymer is an acrylate or PEO copolymer that has been crosslinked.