1. What is corneal staining?
  2. Corneal staining is a consequence of a natural phenomenon which occurs through the continual regeneration of old corneal cells for new ones and therefore some degree of corneal staining is expected in the general population at any given time. Therefore low level corneal staining is commonly observed in contact lens wearers during routine eye examinations.
  3. Are there other causes of corneal staining?
  4. Corneal staining can also be caused by other factors such as:
    1. Damage caused by a foreign body
    2. Damage to the lens which subsequently dries out
    3. Metabolic changes to the eye cells
    4. Exposure to a toxic substance
    5. Poor health due to an illness or infection
  5. What are the symptoms of corneal staining?
  6. Corneal staining is not generally associated with any symptoms.
  7. How is corneal staining detected?
  8. Corneal defects are detected using a yellow dye which is inserted as eye drops. Using a special light, the optometrist can see abrasions and defects which show up as bright spots on an otherwise smooth, dull surface. The dye is washed away by the tears produced by the eye.
  9. Should I be concerned about corneal staining?
  10. When tested, most people will show some evidence of low level or insignificant corneal staining where no action is required. In the event that your optician identifies a significant level of staining they will advise you on what, if any, steps you should take.
  11. Is corneal staining permanent?
  12. No, corneal staining is reversible and, rarely causes any discomfort or eye problems.
  13. Do contact lens solutions cause corneal staining?
  14. Various studies have investigated a possible link as to whether or not solutions are associated with staining however professional opinions vary due to a lack of scientific evidence.
  15. Is there a safety risk with certain types of contact lens solutions?
  16. No, all contact lens solutions undergo toxicity testing in accordance with local governing regulations before they can be made available to the general public.
  17. Why are opticians concerned with corneal staining?
  18. Corneal staining forms an important part of the routine examination to help opticians assess general eye health and wellbeing.
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