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Detached retinas are caused when the retina becomes separated from the other layers of the eyeball. Since these areas of the eyeball are responsible for providing the retina with nourishment and support, detached retinas can lead to blindness if not treated. The disorder is relatively uncommon in the United States, with only about one in every 10,000 people suffering from the condition.

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I think it means your retina is detatching or is going to; the fluid is the "glue" that holds the layers together (and nutures the retina) and it's possibly leaking to behind your retina and detatching it.

http://www.wisegeek.com/what-causes-...ed-retinas.htm