Acrylic lenses, as opposed to resin lenses, contain acrylic resins that are more resistant to UV radiation and less prone to yellowing. Acrylic lenses also tend to be more visually clear and less likely to scratch or fog over time due to their high quality and purity. Additionally, acrylic lenses are often less expensive than resin lenses due to their popularity and higher availability. Resin lenses, on the other hand, are typically more resistant to heat and chemicals than acrylic lenses, and can withstand higher temperatures during the manufacturing process. In summary, the main differences between acrylic lenses and resin lenses are in their composition, visual quality, and resistance to UV radiation, yellowing, scratching, fogging, heat, and chemicals.