How can I prevent eyebrow hair loss during IPL treatment?

I am to receive 6 session of IPL for ocular rosacea by an ophthalmologist. I have read that hair loss from the brow can be a side effect of this and I would like to prevent this. I will be given goggles to protect eyes but nothing for brows. Would covering them with some material like cotton be enough to stop the laser affecting that area or do I need something stronger? I have pale skin and dark hair so I am worried that they will be susceptible to hair loss