If a woman wears coloured cosmetic contact lenses for her husband, there is nothing wrong with it. But if she is wearing coloured contact lenses where others will see her, then this should not cause any fitnah or temptation. Also, there is nothing wrong with wearing ophthalmic contact lenses on the advice of specialists

If a female specialist doctor is available, she should examine the Muslim woman. If no such doctor is available, then a trustworthy non-Muslim female doctor can do it. If this is not possible, then a male Muslim doctor should examine the Muslim woman. If a male Muslim doctor is not available, then a non-Muslim male doctor can examine the Muslim woman.

Hijama in Islam refers to the extraction of blood from the body by means of cupping using a suitable vessel or whatever modern equipment serves the same purpose. For more about the benefits and time of hijama, see the detailed answer.