Cellulose acetate is a plant-based plastic that is flexible, strong and lightweight. Glasses made of this material tend to come in an assortment of colors and patterns and may also be transparent or have a specialized finish. Acetate prescription glasses with plastic lenses are hypoallergenic and durable enough for daily wear.
Many styles of sunglasses have acetate frames. This material allows for a wider range of designs than many other substances. Acetate is less brittle than the petroleum-based plastics used to make frames through the process of injection molding. While acetate glasses may cost more than other plastics, this eyewear material is more durable and renewable.