Why does the old person have the cornea link

Doctor Ke:
My grandfather 86 years old, bodily condition still permissible, the life can take care of oneself, is the eye cornea peripheral has the white ring, doctor diagnoses is the cornea link, said does not have the question, does not need to treat. Asked why the senior citizen does have the cornea link?
Jiangsu stores ××
Stores the reader:
The senior citizen eye cornea edge appears a white or the iron grey ring, in the medicine is called the cornea link, also is called the cornea old person to surround, the non- subjective symptom, does not affect the vision, frequently is discovered by the other people. Is not all senior citizens all has, the formation rate only accounts for senior citizen 40% ~ 50%. Does not have the illness complication, generally does not have to treat. Has the reason not to be bright, the modern times medical research, thought possibly is in the blood lipin excessively many depositions is the result of to the cornea edge, has the comparatively close relation with the arteriosclerosis, and pointed out the cornea link the appearance is the hardened indication, therefore has the cornea link the old person, must specially be careful, positively prevents bursts the hemorrhage, prevents the accident.