Whether or not you have a legal basis for filing a lawsuit for medical malpractice or products liability with respect to the failed cataract surgery depends upon whether a person in the medical field acting as an expert witness would testify that your doctor failed to adhere to the acceptable medical standard of care in your community causing damages to you and whether or not there was a failure of a piece of medical equipment.To get a detailed opinion with respect to your question, I suggest that you consult with an attorney that practices in the area of medical malpractice.