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For dry eyes: Artificial tears are available "over-the-counter"at any drug store. Multidose bottles contain a preservative --usually benzylkonium chloride--which may be irritating or to which you are likely to become sensitive or even allergic if you use it often, e.g. hourly+. Non-preserved formulations are preferable, usually marked "PF" for preservative free, and come in little "single" dose packets containing only 3-4 drops, that can be used for a few applications over a short period of time. Thus, if you are reading for an hour or so, have a packet next to you and put in one drop every 20 minutes or so - or every time the eyes burn and the vision starts to blur. Then blink, blink, blink [like running the windshield wipers after squirting window cleaner on your windshield] . Jacquie