TikTok video with the test.In the clip, she reveals astigmatism could be the culprit as to why someone's vision isn't 20/20.The NHS website explains astigmatism is when the eye is shaped more like a rugby ball than a football, "so light is focused at more than one place in the eye".It can cause blurry vision, headaches, and eye strain – but the good news is that it's easily corrected with glasses and contact lenses.To help discover if this could be something that you have, Dr Carver, of the Better Vision Optometric Centre in Fayetteville, shared a video of a circle consisting of thick black lines.Focus on the picture with your left eye and make a note if anything you see changes."What we're gonna look at is the star here," she says. "What.
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