A structure including an integrally formed diffuser may be formed by depositing a first layer including a first polymerizable material and another material, and depositing a second layer including a second polymerizable material adjacent the first layer. The first and second layers are simultaneously irradiated with light that causes the first polymerizable material and the second polymerizable material to polymerize. There is not an optical boundary between the first and second layers since the first and second materials are polymerized together.