The primary visual cortex is what sends information to the secondary visuals, which are important for color, motion, and depth perception. If the primary visual is damaged, then it can cause problems for the secondary visuals, which are important for the three reasons listed ^.
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The CDC suggests retesting because of the "window period." This is the length of time between exposure to HIV and when HIV shows up on a test. This can take up to three months. So if your test result is negative, protect yourself and get retested after three months.
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