A process for preparing diketopyrrolopyrrole pigments comprises conducting the elementary steps of pigment synthesis in a miniaturized continuous reactor. A computer system comprises an input display for selecting one or more designs and one or more design parameters. Upon generation of the physical address, the memory will either receive data from or provide data to a processor in accordance with the instructions being processed by the processor. The eye alignment assembly includes an optical structure mounted to the frame assembly including a sight point of an optical fiber located near a proximal end of the optical structure and a lens with alignment indicia located at a distal end of the optical structure.