I doubt it is Brooklynellosis. The fish would be showing many other symptoms by now, since the disease advances very fast compared to other infections. Then again, it is possible that it could have spread by now, but the symptoms would be obvious and characteristic. The cause for the eye, as you pointed out, can be potentially many-fold, but it likely originated from a site of local injury. Again, usually unilateral infections tend to resolve themselves, only very rarely needing treatment.
As for salinity and temperature, there is plenty of literature available to the contrary. 1.022 is extremely unnatural for reef environments (Edit: this would only occur in isolated situations, like some lagoons, and areas with a limnic/marine interface). Granted, this won't necessarily harm anything outright, it is well below physiological operating optima for many invertebrates. Measurements of 1000 wild reefs revealed an average of 35 PSU (or ppt--not the same at all, but close enough). This is where I believe you confused my temperature comment. Natural seawater has a specific gravity (a temperature-dependent parameter) of 1.0264 at 77 degrees Fahrenheit. I was not saying natural reef seawater is 77 F. Average temperatures run ~82 degrees, with peak diversity occurring at ~84 degrees. All of this can be independently confirmed.
In any case, if there are any invertebrates in the display, then increasing the salinity should be quite beneficial to them, as well as being able to increase the various solubilities of calcium, alkalinity, and magnesium. I recommend keeping at or near display levels, regardless.