When these cells are injured, they cannot regenerate, and fluid will accumulate in the cornea, resulting in swelling (edema) of the cornea and progressive clouding of vision. Corneal edema can sometimes develop after eye surgery, especially after cataract surgery. Abnormal swelling of the cornea is more likely to occur in people 50 years of age and older. Early symptoms of corneal edema might include blurred vision or haloes, often in the early morning.