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. 1991 Oct;25(5):303-7.
doi: 10.3109/03005369109076602.

The influence of eye colour on susceptibility to TTS in humans

M L Barrenäs  1 , F Lindgren
Affiliations

The influence of eye colour on susceptibility to TTS in humans

M L Barrenäs et al. Br J Audiol. 1991 Oct.

Abstract

In order to investigate the function of the inner ear melanin, noise-induced temporary hearing loss (temporary threshold shift, TTS) was studied in humans with either blue or brown iris colour. Sixty-eight normally hearing teenage boys participated in this study. Hearing thresholds before and after exposure were established with a computerized sweep frequency audiometer in the frequency range 0.8-8 kHz. The noise exposure consisted of a 1/3 octave band-filtered noise with centre frequency 2 kHz at 105 dB SPL for 10 min. The mean TTS in the frequency range 2-8 kHz showed a significant difference with the brown-eyed subjects developing least TTS, and the blue-eyed subjects most TTS.

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