The coherence method might also give misleading results for hearing aids that compress the input signal. We have developed a new method for measuring non-linear distortion that is insensitive to slow acting compression and can be used for any type of input signal. The method is currently evaluated. Hearing and Color Vision after Exposure to Noise, Light, and Styrene in the Plastic Industry Combined exposure of high level noise and solvents, or light and solvents, has been reported to enhance hearing damage or retina damage. It is important to study if synergistic effects occur also at lower levels of exposure.
Data analyses are under way.
The project is run by the National Institute for Working Life. The risk to obtain damaged hearing by a certain noise is highly individual. Attempts to find predictive factors for noise induced hearing loss, NIHL, have so far been without success. New possibilities are now available by measuring the micromechanics of the inner ear. The aim of the project is to find a measurement procedure suitable for judgment of susceptibility to NIHL before a hearing loss has appeared.