Is Greying out on a roller coaster bad?

Greyout can be normal in the situations listed above, but if you notice transient vision loss at any other time, it could be a condition called amaurosis fugax. Greyout in this case could signal an impending artery occlusion, so please contact your doctor immediately.



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Passing out, too, may cause seizures or even permanent brain damage, though Busis is unaware of any instances of that happening on a roller coaster. “More likely, it's just a transient thing,” he says. “It's just a couple of seconds and you come to and you're fine.” [Read: 10 Ways to Lower Your Risk of Stroke.]

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“Standing up too fast, overexerting, becoming dehydrated or taking certain medications can also lead to hypotension — low blood pressure — and potentially, a whiteout.” A less common risk: “Whiteouts can occur with changes in G force,” says Geist, for instance, in a car accident or on a roller coaster.

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Don't ride a roller coaster while under the influence of alcohol or drugs. Drink plenty of water to stay hydrated all day during your visit.

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