Keratoconus is a degenerative disorder of the eye in which structural changes within the cornea cause it to thin and change to a more conical shape than its normal gradual curve.
The classic symptom of keratoconus is the perception of multiple 'ghost' images, known as monocular polyopia. Instead of seeing just one point, a person with keratoconus sees many images of the point, spread out in a chaotic pattern.
It affects around one person in a thousand.
Sometimes something bad can be a blessing in disguise too :)
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