The ophthalmic industry, specifically eyewear lens production, generates substantial waste, during the optical store grinding process, contributing to end-of-life plastic accumulation and posing significant environmental challenges. Lens edging machines consume approximately 20 liters of water per eyeglass lens pair, which is subsequently discharged directly into wastewater systems, releasing pollutants, including micro- and nanoplastics, into the environment. Addressing these issues requires thorough characterisation of the waste released and the exploration of innovative solutions. This study quantifies the wastewater generated during the lens griding process and provides a detailed physical and chemical characterision of this waste stream. The results revealed that almost 50% of the initial material mass is discharged, representing the release of approximately 5800 tonnes into the environment annually. Sub-2 µm particles were identified, as well as, heavy metals, bisphenol A, phthalates, and fluorinated compounds. This study provides valuable information for developing future policies and alternative waste manegement strategies within the ophthalmic industry.
