Wearing of contact lens when fasting, which are normaly dipped in chemical for disinfections.

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

Putting contact lens on one's eyes does not invalidate the fast even if they have been dipped into chemicals, especially if one is in need of them in order to see clearly.

Allah knows best.