Large diameter optic is more than twice the standard, allowing treatment outside the visual axis of the patient. Image magnification factor 1.8x and laser spot magnification 0.56x. Exceptional optics with no chance of the lens button detaching. Lenses have a custom anti-reflection coating and can be used with the appropriate therapeutic lasers. Each lens comes in a sterile pouch. Single use lenses supplied in quantities of 10 per box.