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There are trade-offs involved with selecting any of the technologies available for laser safety eyewear. Filter glass will be heavier than polymer products, but usually provides better visible luminous transmission (VLT). Coated substrates are selected when multiple wavelength protection is required, but these products tend to be among the most expensive and require the most care. The physical properties of polycarbonate make those products suitable for all-day wearing and for molding single lens products with wide fields of view. Finally, consider the work environment. High VLT products are best for low-light environments. Impact resistance is necessary in production environments. UV protection or glare reduction is needed for welding. Dust or splash protection may also be prescribed.