None are round. That does not focus the eye well. They are spindle shape with the front and back surfaces having different rates of curvature. The best are aspheric (which means not round). So round is the worse shape.
Use google images and type in Intraocular lens and see what they look like
JCH MD
Are any of the yellow iols round? And if so are any of those made out of silicone? Thanks