Disclosed is a transparent polymeric diffusion film exhibiting at least 50% transmissivity containing a thermoplastic polymeric material with internal microvoids and containing a plurality of complex lenses on a surface thereof. These compounds and compositions are useful as pharmaceutical agents. Related decoding methods, as well as encoding and decoding devices are also disclosed. It the difference is not within the error bar, the distance value is changed for the pixel being processed by a small fraction while keeping the new distance value within the range defined by the original distance value for the pixel being processed plus or minus the error bar. The first transceiver assembly comprises an indicator assembly. A phaco-probe incorporating the transducer is also disclosed.