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If you have Keratoconus
and see well, you can participate in many sports, including amateur boxing if you wear an enclosed polycarbonate protective lens
goggles over your contacts. However, with Keratoclonus, you are at high risk of ruptured globe from head blow, even if not directly on the eye from boxing. I suggest that you get evaluated to determine how bad your keratoconus is, if you can avoid it, that would be a good discussion. However, if you have to, then the above enclosed protect and enclosed polycarbonate lens goggles will serve you well.
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This is for information only and should not replace the recommendation of your doctor.