RX Prescription Lenses for the IST Pro Ear Mask ME80 - Optical Lens(Far Sighted and Near Sighted) Tempered, scratch resistant glass Left and right lenses are interchangeable Lenses are sold individually Price is per single lens Corrective lens for use with: MSK74 Please note there will be an additional 2 to 3 days processing time for most RX lenses Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.