Lighthouse lenses are specially designed optical devices used in lighthouses to project light over long distances. These lenses, often made of glass, are shaped to focus and amplify the light emitted from a lamp, making it visible to ships at sea. The most famous type is the Fresnel lens, which uses a series of concentric rings to reduce the amount of glass needed while maintaining clarity and brightness. The design of lighthouse lenses allows for various light patterns, helping sailors identify specific lighthouses. Each lighthouse can have a unique light sequence, known as a light characteristic, which aids in navigation and enhances maritime safety.