Remedies Needed For Scar On Cornea

Two years ago, herpes zoster caused an infection in my cornea. When it healed, it left a scar beneath my pupil that didn't affect my vision.

For the past year and a half, the scar alternates between a dormant and active state. When it's active, it gets darker (milky white rather than clear) and grows a little. This does affect my vision. Even when it's active, it isn't inflamed. Inflammation isn't an issue

Can anyone suggest a natural cure? Some suggested urinetherpy (applying urine on my eye - not drinking it) but I couldn't find enough info on it to know if it was safe and helpful.

Thanks!