Supplementary close up lenses are usually sold in +1, +2 and +4 dioptres strength. Reading glasses (non-prescription) are also usually sold with the dioptre strength written on them so it is theoretically possible to use one of these lenses for close up shots.

However, you really need to be able to view through the taking lens to be sure that you have the subject in focus so I don't think it will work with a 110 Instamatic without a lot of trial and error.