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In page Cerebral achromatopsia:

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The most apparent distinguishing characteristic between congenital achromatopsia and cerebral achromatopsia is the sudden onset of color vision loss following a severe head injury or damage to the occipital lobe following a stroke or similar ischemic event.[1] Non-invasive imaging techniques can be the most helpful in determining whether the area of damage following a traumatic event is correlated with color-vision processing. Simple diagnostic tools can also be used to determine whether a patient is a likely candidate for further testing, as advancing imaging procedures can often prove expensive and unnecessary.[citation needed]