Should the security door be equipped with cat's eyes?

First of all, let's talk about the role of cat's eyes. The technical term for cat's eye is door mirror, which consists of two lenses. When we looked out from the door, the objective lens was concave and the eyepiece was convex. Finally, we can see the upright and simplified image of tourists. Theft-proof cat's eye acts as a concave lens. A concave lens diverges light. Therefore, "cat's eye" is a concave lens. Its principle is that the concave lens diverges light and sees the upright and reduced image of the visitor. There have been many recently. After repeated investigations, the police finally determined that the thief opened the security door through the "cat's eye". These criminals took advantage of the residents' deep sleep in the middle of the night to loosen the "cat's eye" first, and then took out the loosened "cat's eye" with iron clips. After the "cat's eye" was removed, criminals used the self-made special tool-"7" sleeve to "grab" the door handle, open the security door, and then burglary. And now there is a peeping tool on the market called "anti-cat's eye", which sells well online. This tool is specially designed for the "cat's eye". Users can use it to peep at everything in the room from the outside, leaving residents with no privacy at all. Due to the special function of "cat's eye protection", once it is used by criminals, it may lead to illegal and criminal acts. I think, if you really want to improve the safety, it is suggested that owners add a cover to the indoor lens of their own "cat's eye" to actively prevent the outside world from peeping. Add an inner door and put the cat's eye on the inner door.