In summer or spring season it is more common, there is no permanent remedy, but sometimes change of place do help& Sometimes it disappear with passage of time. You have to choose  such eye drops which have no side effects even after prolonged use,you may use Pataday eye drops once or twice daily & genteal eye drops 3-4 times & if you get relief you may continue using these drops,having no side effects  but if you don't get relief you should consult ophthmologist for other drops because you will have to follow precaution as advised by ophalmologist.