can you compost contact lenses?
No — contact lenses are hydrogel plastic that fragments instead of breaking down. Never rinse them down a drain, either.
which bins can take it?
- hot pile no
- cold pile no
- worm bin no
- bokashi no
- tumbler no
- curbside no
- curbside: Too small to sort and not organic — lenses become permanent specks in finished compost.
why?
Soft lenses are silicone hydrogel or poly-HEMA, water-swollen plastics with no route into a compost food web. Arizona State researchers estimated that 6 to 10 metric tons of lenses reach US wastewater each year from people flushing or rinsing them, where treatment shears them into microplastic fragments that settle into sludge. A compost pile does the same thing, more slowly.
watch out for
- Rigid gas-permeable lenses are a harder plastic and last even longer, and the foil blister plus polypropylene case that dailies arrive in are recyclable only through mail-back programs, not the curbside bin.
what to do instead
Put lenses in the trash, or collect them for one of the free mail-back recycling programs run by lens makers and many optometry offices, which take lenses, blister packs, and foil together.
quick answers
Are there biodegradable contact lenses?
Not on the market. Lens polymers are chosen for oxygen permeability and optical clarity, and no material that degrades in soil holds those properties while sitting on an eye for twelve hours.
What about the solution and the case?
Saline is salt water and can go down the drain. The case should be replaced every three months; it's a #5 polypropylene, taken by some curbside programs and by the mail-back kits.