What do you have to hand now?

[Jonas]

Actually Mort, "The Texas Way" is to save the bug spray for the wasps and hornets and shoot the intruder with a pistol, rifle, or shotgun in the caliber of the homeowner's choosing. Be that as it may, for the UK folk who's access to firearms is, shall I say charitably, limited, "Wasp and Hornet Spray" would be extremely effective in stopping an intruder or three bent on theft and mayhem. Since it's a fairly common product used around the home, purchasing and owning a few cans of the stuff would not put the UK homeowner on a government list that they'd rather not be on anyway.

In a true SHTF situation, it is doubtful that intruders so blinded could get the medical treatment needed to save their eyesight within the limited time frame necessary and then pay a return visit to the homeowner later for retribution, but rather would be absorbed into the general panicked population where governmental public assistance programs for former housebreakers with extreme vision deficiencies would be very limited at best.