Well, yes tea tree oil can be good for blephariti. And first, you should know that Blephariti is inflammation usually involving the part of the eyelid where the eyelashes grow. And when it occurs, your eyes can eventually become red, irritated and itchy. According to some researches, double vision and blurred vision can be the common symptoms. And at this moment, you can just have some tea tree oil on your eyes. And in that way, it will just be effective, for tea tree oil contains a cosmetic product and purcelin oil that can help to reduce the inflammation. Also, you can just try some warm compresses. For example, you can put a damp, warm washcloth on the infected eye. Besides, just wear a pair of eye patch so that it can just protect your eyes from further infection. Anyway, just be careful about it.