Vision in echolocating bats - Fladdermus.net

Tab. 1. – Eye diameter and optomotor responses to patterns of different fineness in four species of
insectivorous bats. The asterisks indicate that the 5 o pattern was not tested and that the bat did not
respond to finer patterns.
Ambient Eye diameter Minimum
Species Ind. light (lux) (mm) separable angle
Plecotus auritus 1 0.6 1.6 45’
2 0.6 1.8 2.5°
3 0.6 not measured 1°
4 0.1 1.7 1°
5 0.1 1.7 45’
6 0.7 not measured 30’
7 0.2 not measured 45’
8 0.3 not measured 1°
Myotis mystacinus 1 0.6 1.0 no response*
2 0.6 0.9 no response*
3 0.1 not measured 5°
Myotis brandtii 1 0.1 not measured 5°
2 0.1 not measured 5°
Myotis daubentoni 1 0.1 1.2 5°
2 0.1 1.3 no response
3 0.3 not measured 5°
90