Effect of water turbidity on the visual acuity of harbor seals (Phoca vitulina)

@article{Weiffen2006EffectOW,
  title={Effect of water turbidity on the visual acuity of harbor seals (Phoca vitulina)},
  author={Michael Weiffen and Bettina Moeller and Bjoern Mauck and Guido Dehnhardt},
  journal={Vision Research},
  year={2006},
  volume={46},
  pages={1777-1783}
}
The underwater visual acuity (the angle subtended by the minimal resolvable line width of high contrast square wave gratings at a viewing distance of 2m) of two male harbor seals was determined at different levels of water turbidity. Starting with visual acuity angles of 5.5' and 12.7' in clear water we found visual acuity to decrease rapidly with increasing turbidity at rates of 7.4' and 6.0' per formazin nephelometric unit (FNU). Besides the individual differences in visual performance of the… CONTINUE READING