Microtubules were regularly demonstrated in lens cells. They were especially abundant in the cortex at the equator where the movement of lens cells is most active. The microtubules may serve to maintain the shape and rigidity of the lens cell at the portion of constant movement.
Kuwabara T. Microtubules in the Lens. Arch Ophthalmol. 1968;79(2):189-195. doi:10.1001/archopht.1968.03850040191017