Typically no, but it does depend on the sunglass lenses as well as the direction of the sun light. For example, gradient tints that are dark at the top and lighter at the bottom allow more light to pass through the lens making the insert more visible. If you don't want your insert to be seen, choose a pair of sunglasses that have dark lenses, polarization and mirror coat helps too. The Pit Vipers below are in direct sunlight with a SVED Rx Insert: It should be noted that our inserts have the best possible chance of not being seen compared to any other insert, due to the fact that our lenses are cut in a rimless fashion to optimal size and shape and securely attached to your nose piece using our long-lasing suspension system.