Circulating fluid velocity fields modelled in the mouse lens. 3D vector maps of circulating fluid velocities calculated from the model for the extracellular (A) and intracellular (B) space. The maximum fluid velocity in the extracellular space was inward at the anterior and posterior poles and the magnitude of the extracellular fluid velocity dropped towards the equatorial region. Conversely, the intracellular fluid velocity fields were predicted to be outward, suggesting the exit of the fluid via intracellular space throughout the lens; with the peak of intracellular velocity calculated to occur in the equatorial region of the lens. The numbers on the colour-bar are in cm/s units.