When asked to recommend an art book, I frequently compare art books to chemistry books or math books. These books usually assume you understand, at the minimum, the symbol for salt or the math equation to measure an area. For this book, it would help if you are familiar with the main phases of representational styles in art. For this is not a picture book, but rather reading material with explanatory pictures on the psychology of perception.
But, Dr. Gombrich wrote for the general public and nobody does it better. Having read all his books more than once, he takes you by the hand, leads you down his primrose path, and entices you by way of his poetic language; much like walking in a garden with a gardener. You may not know all the plant's latin names, but the experience is rewarding.