Basically, BC stands for before Christ and AD stands for Anno Domini, Latin for in the year of our Lord.. The transition point between BC and AD marks the approximate time when God incarnate came down to earth to live with His creation.
The only area that is involved is the spot direcly behind my right ear lobe where it sinks in, not futher behind where the gland or lymph node is. I have gotten swollen lymph nodes before, this is very different. My inner ear, and throat and all other surrounding areas aren't in pain at all.
If your right parietal lobe is damaged by a stroke, injury, a brain tumor or lesions, you're not going to process anything you see on the left side of your body. It's not that your left eye doesn't work, it's that your brain can't make the connection to what you're seeing.