Things You Will Need
As of October 2010, these peepholes are available for about $90. Some people view these gadgets as a huge invasion of privacy so use them with caution.
Reverse Peephole
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Drill a hole through your front door. The hole should be near the eye level of an average adult, about 5 feet, and should be in the center of the door. Use a 1/2-inch drill bit to drill an appropriately sized hole.
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Clean out the hole using a screwdriver. Scrape the sides of the hole with the screwdriver to remove any shavings or wood chips.
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Insert the lens portion of the peephole. Traditionally, the lens portion of the peephole goes on the side of the door that faces the street. To create a reverse peephole, insert the lens portion of the peephole so that it faces the inside of your home.
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Insert the viewing piece of the peephole. This portion should face outside. Push the viewing piece towards the center of the door until it fits tightly.
Spy Gadget
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Purchase a peephole reverser spy gadget.
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Set the peephole reverse on the door, directly on top of the peephole.
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Move your eye towards the viewer and peer through the peephole.