New user errors
Leaving lenses overnight in preservative free saline (acanthamoeba risk due to misunderstanding about solution types)
Using water to rinse off a cleaning solution (acanthamoeba risk due to obsolete information)
Breaking a lens in a basket case (size not compatible, or not sufficiently careful opening/closing)
Cleaning, but not disinfecting (misunderstanding of lens care needs)
Using Clear Care but failing to completely rinse off a cleaning solution, resulting in solution mysteriously disappearing overnight