Anatomy. The lateral collateral ligament (LCL) is a one of the four major ligaments in the knee. The LCL is on the outside of the knee connecting the thighbone (femur) to the smaller bone in the lower leg (fibular). Its main function is to avoid varus stress across the knee (where the knee buckles outwards).
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Regular migraine attacks can also cause vision problems, called an aura, which can involve flashing lights and blind spots. But these symptoms usually appear in both eyes. See your doctor to find out if you have ocular migraine. He can rule out other conditions that can cause similar symptoms. Be ready to describe what you went through as completely as you can to help him figure out what's really going on.