Seeing can be difficult. This dissertation aims to bring out the philosophical significance of this commonplace fact. By examining the roles of difficulty, agency, and skill in visual experience, it sheds light on two related sets of philosophical questions: one about our ability to perceive the world, the other about our ways of representing it. The first two chapters get at the basic structure of the experience of seeing. I approach this by concentrating on the notion of an opportunity to see. This notion is a familiar one, but upon examination it makes trouble for a traditional and tenacious idea, that seeing is the automatic upshot of a certain mechanical process – a causal chain linking things in our environment to our perceptual organ...