Have your local health department or a lab test your water for bacteria, and If your Report shows a P next to either E.coli or Coliform Bacteria, that means there is the Presence of Bacteria & NO amount of this Bacteria is acceptable so the water MUST be treated to kill the bacteria to make it potable!
Optometrists also test for glaucoma and other eye diseases, and diagnose conditions caused by systemic diseases, such as diabetes and high blood pressure, referring patients to other health practitioners, as needed.
Eye doctor: Either an ophthalmologist (a doctor who can treat eye problems both medically and surgically) or an optometrist (someone who is trained to examine the eye for certain problems, such as how well the eye focuses; optometrists are not medical doctors) should check your eyes at least once a year.