Did you ever try on a pair of your mother’s clip-on earrings? Or maybe you own a pair yourself. If so, you’ll be familair with the way they use a small and cleverly designed clamp to clip the gaudy ...

They’re like a convertible for your eyes: shades that clip on over your prescription lenses. Yes, they’ll save you cash on an expensive pair of tinted spectacles, but we’d be lying if we said this ...