The present disclosure describes an apparatus for testing to assess the cone photoreceptor pathway by determining the sensitivity of the cone photoreceptors. In one embodiment, the first and second encoders are each configured to encode the information, wherein the second encoder has a higher capability than the first encoder. The mass augmentation device reduces the propagation of mechanical oscillations that are produced during operation of the magnetic resonance apparatus, and which otherwise would produce unwanted noise. Such a food product includes a balance of long chain and short chain omega-3 highly unsaturated fatty acids. The position of the transitions in the output signal is compared with a reference curve to determine position deviations between the output signal and the reference signal. Said copolymers are characterised in that they comprise a hydrophobic sequence constituted by: either a homopolymer consisting of recurrent units corresponding to the general formula : .