[Gayle]

We're all sat at a computer and no doubt many of us have mobile phones, dishwashers, colour TVs, radio alarm clocks, etc. But what is the one simple invention that you could not live without?

For me, it's my prescription sunglasses. It's the only time of the year when I wear glasses properly which means that I can see clearly. I'm too vain to wear my real glasses all the time and too squeamish to wear contact lenses. I love my prescription sunglasses.