Adam Clarke on Numbers 24:15

The man whose eyes are open - See on Num 24:3 (note). It seems strange that our version should have fallen into such a mistake as to render שתם shethum, open, which it does not signify, when the very sound of the word expresses the sense. The Vulgate has very properly preserved the true meaning, by rendering the clause cujus obturatus est oculus, he whose eyes are shut. The Targum first paraphrased the passage falsely, and most of the versions followed it.