To use these spare lenses, first carefully remove the old lenses from your Madison Enigma glasses. Then, align the new lenses properly and gently fit them into place. When wearing, you'll enjoy clear vision and reliable UV protection. Remember to keep your glasses in a protective case when not in use to avoid unnecessary scratches. Clean the lenses with a soft, lint - free cloth and a bit of mild lens cleaner. Avoid using harsh chemicals or abrasive materials as they can damage the lenses. With proper care, these lenses will serve you well for a long time.