Next time you lose an eyelash, don’t just brush it away, save it. You’ll also need a length of string of a natural material. Silk is the best, but cotton or wool will also work just fine. (Yarn will do, but no acrylics.) Cut the string to the length of the span of your hand. Perform whatever cleansing and grounding rituals you think are appropriate before spell work. Place the eyelash on the string and tie a tight knot around the lash, chanting:
“Bind the eyes of all that see. Secrets here but no harm be.”
Wrap the string around the doorknob of the room you wish to protect and secure well. As long as you don’t do anything blatantly and obviously pagan, anyone who might accidentally see your magic gear will not realize its significance.