There is no direct way to prevent corneal opacification. Fortunately, this is less common than cataracts of the lens. As with cataracts, you need to be alert for changes in vision, and you need to call these to the attention of a health professional. Corneal transplants and special types of contact lenses are very effective in countering this problem. The usual mistake is to wait too long for correction, thus decreasing the quality of life in the period before diagnosis and treatment.