Thank you so much! Your help is much appreciated!
Hi, a gray or whitish arc that sometimes develops around the cornea is called arcus senilis. Many people refer to the condition as "ring around the pupil." The whitish arc you see is associated with fat (lipid) deposits. Sometimes the condition is associated with cholesterol levels in the body. So, ask your father to consult his doctor and have a lipid profile done. Regards.
"Recently I have noticed a white LINE on both of my father's eyes"
- I am so sorry, I keep on making mistakes. Sorry again!
"Recently I have noticed a white LINE my on both of my father's eyes." Sorry ,it's a typo.