The way we see is the way we go blind.
Seeing always involves some evaluation, and any evaluation one makes can never be one hundred percent accurate and it always changes with time. The perfect evaluation, if there is such thing, is to make no evaluation, to have no opinion other than accepting the way things manifest right now. This is not yet the truth but at least the best approximation our ego can manage. To let go the ego we must first teach it to recognize itself as unnecessary in knowing the truth because truth already stand as it is.