Yes, it is said that castor oil over several months can clear up cataracts. But I found several references stating that 100% castor oil causes apoptosis of corneal cells. I wonder whether a 5% solution of castor oil, for example, would not be toxic to the cornea, and yet still clear up the cataracts?
To know that, we would have to do tests on corneal cell lines.
If it checked out OK at 5%, then we would have to establish that it was still effective even at 5%. But yes, we need to establish lack of toxicity and cataract reversal effect in vivo at several different concentrations of castor oil in a carrier - 1%, 5% and 10%, for example. In fact, we need to determine the optimum concentration of castor oil here to do what we want, and do it safely.