Figure 3.

Visual performance as a function of eye size (pupil diameter). The visual ranges for four different targets are plotted in (a), and the corresponding performance returns (dr/dA) are plotted in (b). The same calculations as in (a,b) but with the visual range converted to visual volume, is given in (c,d). Point source intensity: 10¹¹ quanta s⁻¹. The coastal water type is comparatively clear and most closely corresponds to Jerlov type III [25]. See the electronic supplementary material for water quality and radiance versus depth.