A stumbling block causing an inability to perceive the truth, i.E.
A bad influence; doubt and unbelief
(Waterfall) To discover oneself having cataract in a dream means suffering from sorrow, sadness and dismay.
This is really a dream of water, so the meaning will depend upon the state of the stream.
If the water is clear and running easily, then expect domestic happiness.
This is a luck omen if In your dream (here is a sense of pleasure.
If the cataract frightens you, the portent is ominous.