IMPORTANT NOTE: Please make sure to double-check that the uploaded prescription and selected options are correct. This is a made-to-order custom product, and there are no returns, cancellations, or exchanges allowed. All orders are final. Current lead times are around 4 weeks. If you have any questions before ordering, feel free to send an email to [email protected]., or click the chat bubble below. As part of the order process, we require a current prescription. You can either upload the prescription on this product page or send it to us via email at [email protected].. Transform your C21 protective mask into a personalized defense system with our custom prescription Spectacle Kit. Engineered specifically for the C21 platform, this advanced optical solution ensures crystal-clear vision when it matters most. Here&';s How to Order Your Spectacle Kit When it comes to ordering a prescription Spectacle Kit for your gas mask, we&';ve made it as easy as possible. STEP 1: Select one of the four lens types: "Single vision" are relatively uniform, slightly thicker prescription lenses that have been optimized for use in a gas mask. "Bifocal" prescription lenses have a lens for distance vision up top and a magnification lens for reading on the bottom, with the proportions optimized for your specific gas mask. "Progressive" or "no-line" prescription bifocals provide a gradation that&';s ideal for those who need close-up vision at 12 inches as well as intermediate vision to see something like a gun sight. "Plano" lenses are super thin lenses without any prescription. This lens type is ideal for those without a vision issue who&';d like to add SMOKESIGHT XT or True Color Reception lenses to their gas mask. STEP 2: Select one of three lens colors you&';d like. Clear Lenses - Maximum light transmission for general use. Grey Tinted Lenses (True Color Reception) - Optimized for bright conditions while maintaining color accuracy. Yellow Tinted Lenses (SMOKESIGHT XT) - Engineered for enhanced visibility in smoke and low-light conditions. STEP 3: Upload your prescription, including your Pupil Distance Measurement: NOTE: If your PD does not appear on your Rx form, contact your optometrist for PD if it is not listed on your prescription, and they should be happy to provide your PD measurement over the phone. Then simply write your PD on your Rx form, take a picture, and upload it onto this product page. Your PD tells us where to place the center-of-optics in your lens for optimal vision. Allow 4 weeks for custom manufacturing. -- C21 Gas Mask Spectacle Kit&';s Revolutionary Lens Technology Our digital laser manufacturing process achieves precision 12-21 times greater than traditional grinding methods. This technology enables: Perfect vertex distance compensation for gas mask use Precise pupillary alignment Optimal curvature matching with mask visor Distortion-free vision across entire field of view Professional-Grade Performance The C21 Spectacle Kit features: Reinforced, heat-resistant frame construction Quick-mount system for rapid deployment Secure positioning with precision lock screws Compatible with full range of CBRN protection scenarios Enhanced Vision Options of C21 Gas Mask Spectacle Kit SmokeSight XT (Yellow): Reduces eye strain in challenging conditions Enhances contrast in smoke and low light Improves visibility of safety equipment Optimal for both day and night operations True Color Reception (Grey): Superior glare reduction Enhanced bright-light visibility Accurate color perception Reduced eye fatigue Important Notes Custom-manufactured to order - no returns or exchanges Verify prescription accuracy before ordering Questions? Contact [email protected]. Take your protective equipment to the next level with prescription-ready clarity that matches your exact visual needs. Order your C21 Spectacle Kit today for uncompromised vision in critical situations.