If you lose a contact lens on the floor, just tie a piece of stocking / pantyhose over the nozzle of the vacuum cleaner. Switch it on and vacuum the area where you think you dropped the lense. You will soon the lens stuck to the pantyhose.
Gaijins Handy Enviro Friendly Hint for the week- Garden Spray For Ants and caterpillars
Try a Chilli spray with a few chillies together with water and pure soap OR
another way for get rid of caterpillars on vegetables is sprinkle them with white pepper - They hate it!