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In page Central serous chorioretinopathy:

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The diagnosis usually starts with a dilated examination of the retina, followed by confirmation by optical coherence tomography, fluorescein angiography, and indocyanine green angiography. The angiography test will usually show one or more fluorescent spots with fluid leakage. In 10%-15% of the cases, these will appear in a classic smokestack shape.[citation needed] Differential diagnosis should be immediately performed to rule out retinal detachment, which is a medical emergency. A clinical record should be taken to keep a timeline of the detachment. The affected eye will sometimes exhibit a refractive spectacle prescription that is more far-sighted than the fellow eye due to the decreased focal length caused by the raising of the retina.[citation needed]