I've been complaining to Steve for weeks about my headaches. Every time I spent too much time reading or watching telly, I would get a sore head. I credited this to eyestrain and the fact I was getting older. I wear contact lenses every day and have a different prescription strength for each eye. I changed to a pair of new lenses recently and my headaches went away. I'd been putting the wrong lens in each eye. Talk about a blonde moment!