He very well may have been. Click here to read a fascinating article about vision expert Kazunori Asad’s explosive hypothesis. You’ll find many good illustrations in the article.
Vincent van Gogh, Vase with Twelve Sunflowers, 1888, oil on canvas, 35.8" x 28.3", Neue Pinakothek, Munich, Public Domain via Wikimedia Commons.
Was Van Gogh Color Blind?