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As described in greater detail later, presbycusis results in reduced auditory acuity making it difficult to separate speech from background noise. A study of age-related vision and hearing impairment by Chia et al found that each one-line reduction in best-corrected visual acuity was associated with an 18 per cent increase in the prevalence of hearing loss (defined by pure-tone thresholds 25dB above normal in the better ear for frequencies between 500Hz and 4kHz); similarly, each one-line reduction in uncorrected visual acuity was associated with a 13 per cent increase in the prevalence of hearing loss.1
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