slightly off the technical topic, here’s what happens.

If you cry ever–make sure you take your disposable contacts out and either scrube them like crazy to clean them or just trash them.  For me I continued wearing and cleaning mine as normal, then suddenly driving down the road my eyes were watering and I had trouble opening one eye–apparently it had been scratched or so, by the [now crusty] contact lens.  The doctor prescribed antibiotic drops.

Beware