If you can refer back to the posting guidelines for this particular section, and make sure to include as much information as possible, including a clear picture, then we'll be able to assist you better and faster. Like Kevin stated, clouding of the eyes can be caused by a number of factors, all of which require differing treatments. Therefore, until more information is provided, and most importantly, your parameters and a clear photo, there isn't much we can suggest other than generic across-the-board treatments such as separating the affected fish from others, treating the water with a broad spectrum anti-fungal and anti-bacterial (Use a safe, gentle one like Pimafix and Melafix), raising the tank temp and oxygenating accordingly, performing a water change (remember to check filter media, and rinse if needed or change), etc. Other than that, there isn't anything specific we can tell you until we have a better idea of what might have caused the condition.