Polymethyl Methacrylate (PMMA) is a versatile material known for its high optical clarity, durability, and UV resistance. In recent years, the development of PMMA composite films containing a variety of materials such as inorganic nanoparticles, organic dyes, and conductive polymers has opened up new possibilities in optics and photonics. This review paper investigates significant advancements in PMMA composite films, with a particular emphasis on their impact on optical properties. We discuss the synthesis and characterization of these composites, focusing on the methodologies used in their research and the resulting changes in optical properties such as refractive index, transparency, and UV resistance. The review delves deeper into the practical applications of PMMA composite films, which range from advanced optical lenses and filters to components in electronic displays and photovoltaic cells. The article also discusses research and application challenges, such as maintaining the material's inherent optical clarity while integrating composite materials. The paper concludes with suggestions for future research directions in this rapidly evolving field, focusing on the potential for new technologies and applications. This review seeks to provide a comprehensive understanding of PMMA composite films and their importance in future technological advancements by conducting a thorough analysis of current literature and findings.