People naturally squint/frown in the sunlight to shield their eyes from the bright light. People in need of a browlift or eyelid surgery may actually complain of visual obstruction/dimming of light due to excess skin blocking the visual field. When we frown, this gives a similar effect and blocks some of the light. But what happens when botox takes away this ability to squint/frown in bright light? Does this damage vision since we can't shield our eyes from the light without hat/sunglasses?
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