to be honest, the first part of your question is confusing. do u mean she was previously on anti-coagulants??? or was placed on them after the accident?? anyway, amaurosis fugax can be very serious, but not for the eye only, necessarily. what it really is, simply put, is a "mini-stroke" involving the circulation of the eye. it causes temporary loss of vision in one eye for up to a few hours. it may be complete loss or only partial , but it is in one eye.