Hello, I have suffered from dry eyes, blurry vision, itchy morning eyes and aching eyeballs from working long hours on a laptop computer. Quite accidentally I found a cure that works for me! One week at work I seemed to be CRAVNG Japanese food. A Japanese restaurant is just walking distance from my office. Three days in a row I walked to the Japanese restaurant for lunch! After my third trip to the Japanese restaurant I noticed that particular afternoon that my eyes were producing more tears, I was blinking more often while working on the "tube" and my saliva also seemed to have increased! My eyes did not "ache" at the end of that work day! I believe I have traced it to the large bowl of miso soup (with extra seaweed!) I habitually consumed at the start of my lunches at the Japanese restaurant! As a test I purchased instant miso soup at my local health food store... careful to select a brand of instant miso soup which listed seaweed as one of the ingredients! I think the instant miso soup mix contained a seaweed named "dulse". Instead of coffee or tea I now make a cup of hot miso soup as a beverage whenever I am working long hours on my laptop. This has seemingly "cured" my dry eye and aching eyeballs. I know this seems too simple but it has worked quite well for me. I believe the iodine in the seaweed provides me with just the right amount of iodine supplementation to stimulate production of tears and offset the eyestrain I was suffering from... It may have been that I was suffering from borderline hyperthyroidism or somesuch! I don't really know all of the science behind iodine deficiency but I do know sea vegetables (kelp, dulce... etc.) contain trace amounts of iodine. I also purchased sea kelp granules at my local health food store. It is packaged in a round cardboard "shaker" container something like sea salt is packaged. I add about 1/4 - 1/2 teaspoon of kelp granules to home made soups, broths and gravies etc. I also sprinkle the kelp granules on salads after tossing the salad with balsamic vinegar and olive oil. The kelp granules then "stick" to the salad greens. This is another easy way to get your daily requirement of iodine. I keep a cardboard shaker of kelp granules in my computer laptop knapsack. I carry the kelp granulse in my jacket pocket so I may sprinkle some on whatever I am having for lunch. This has worked for me. Try it! Who knows? It may work for you! BTW I have been sipping a cup of hot miso soup while writing this response!