I have the back up camera in my Focus St and I find it easy to use. I'm 67 and wear glasses. You may want to get some bi-focal glasses and just wear your glasses all the time. Just a thought.
You obviously don't drive a sedan. Before there were SUV/ CUV's there were trucks and other large vehicles on the road but the percentage was small. Now most have a larger / tall vehicle. That is all I was saying. I didn't say I could see around trucks ever.