According to Digideep's housing finder, there are no wet lenses available for the EWC-90. It may not be threaded. That doesn't necessarily mean you can't adapt them. You just have to be a little more clever.
If you're not sure of the problem, I suggest taking macros topside with adequate light to check the range of your camera. Are you setting it on macro? If the camera will take good, well focused pictures at the same range topside you usually need to light the subject more so the camera will focus underwater. A focus light will do this for you. It is not at all unusual for point and shoot cameras to have close focus issues underwater. One other solution is to lock focus on a large solid object the same distance away, then move the camera to your subject and shoot the picture.
