Pilestone Colorblind Lens D (Protan): clip on lens. Never used.

Lens D (Protan): Designed specifically for protan (red color vision deficiency). 100% UV protection. Advanced light-filtering technology. Outdoor & Indoor technology. Glasses are designed specifically for bright environments, however, they have implemented the optimal indoor technology to help detect colors in lower lighting conditions. Titanium coated lenses. Experience a world of true colors with Pilestone's clip-on color blind glasses! Whether you're on a hike or at a family gathering, these clip-ons easily attach to your glasses to bring clarity to your vision and enhance your experience. With branches worldwide, our clip-ons have brought the joy of color to millions of lives. Don't let color blindness hold you back any longer, try Pilestone clip-on glasses today!