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I am happy to assist you with your question today. Yes, blepharitis could be causing some of your symptoms. You mention itch, however, which is a common concern with allergic conjunctivitis which can cause redness, itch, discomfort, and even blurry vision. If the problem is allergic in nature you could try an over-the-counter drop called Zaditor or Alaway which should be taken twice daily. You said that you have tried other drops in the past. I suggest trying either of the two mentioned above if you haven't already. The second set of symptoms you noted (sand in eyes and pricking feeling) along with the blurred vision are classic signs of dry eye disease. Dry eye disease affects females more often than males and often worsens over the years. Dry eye is first treated with artificial tears (I suspect you have already tried these among the "salves & eyedrops) but, I often find that my patients who still suffer from symptoms after artificial tears (and even lid scrubs) will require a more aggressive treatment.
Among the more aggressive approaches include prescription eye drops such as Restasis or even some in-office procedures to promote tears to stay on the eye.
I am more than happy to discuss these options further. It sounds though, that you have a multi-factoral problem and I suggest maintaining the lid scrubs, adding the allergy drops and potentially obtaining a dry eye workup.
I will be available for follow-up questions should they arise. Please don't forget to offer a positive rating once your question has been answered fully. Thanks.
Sorry, I've tried twice now to reply but it's not going thru. I'll try once more. I've determined I have blepharitis or ocular rosacea, another name for it. I have ALL the symptoms. Thanx for your help.