Occult CNV
Wet Macular DegenerationThe other type of wet macular degeneration is classic choroidal neovascularization.The vast majority of cases are occult or a mix of occult and classic. 
Occult CNV is the most common type and is the result of a slower leak compared to classic CNV. Because of the gradual leak, less fluid escapes and the macula does not become as elevated and uneven. Therefore there is typically a slower loss of vision. As the newly formed blood vessels leak, fluid builds up under the macula and raises it up from its normal position. This is what causes the early symptom of wet macular degeneration - straight lines appear wavy. Whether it is a fence post or a flag pole - normally straight objects appear distorted. However, occult CNV can develop into classic CNV. It is often difficult to determine its origins or where the bleeding begins and ends even with an angiogram. Because it is hard to know where to treat this bleed, it is more difficult to treat.
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