Nutrifill
Nutrifill is a preservative-free saline solution with electrolytes (Calcium, Magnesium, Potassium, Phosphate, Sodium). As a buffered saline, it has additives which maintain the pH at a level similar to the eye.
Nutrifill is packaged in 10mL vials and in a box of 35 vials. It is particularly popular with people who have ocular surface diseases.