While keratoconus can happen at any stage of life, young people between the ages of 10 and 25 are most likely to develop this disorder. For individuals with keratoconus, their cornea, the clear layer in the front of your eye, gradually thins and begins to bulge outward. Keratoconus typically causes nearsightedness

Herpes Zoster (Shingles) If you ever had chickenpox, you’re at higher risk of developing shingles later in life. Shingles can affect many parts of the body. If it travels to your eyes, your cornea can become inflamed and even scarred. Corneal damage might not be apparent until months after the shingles