You know that painful itching you sometimes feel when you’re out and about in dry weather? Where it feels like there are tiny grains of sand lodged behind your eyelids which refuse to come out no matter how hard you blink or rub. Yeah, not very nice is it? There’s any number of reasons why we get dry eyes. In some cases it’s a clinical issue, in others environmental, but now there’s a brave attempt to deal with the problem using an…