Which symptoms are associated with corneal toxicity from contact lenses?

Which symptoms are associated with corneal toxicity from contact lenses?

• A. FBS and photophobia
• B. Itching only
• C. Tearing only
• D. Painful red eye with discharge

Answer: (A)

Corneal toxicity from contact lenses mainly involves disruption of the corneal epithelium, so the most telling signs are a foreign body sensation and photophobia. When the corneal surface is irritated, the nerves there trigger a gritty, scratchy feeling and sensitivity to light, reflecting surface disruption and nerve irritation. Itching, by contrast, points more to conjunctival irritation or allergy rather than direct corneal injury. Tearing can occur with irritation but isn’t specific to corneal toxicity, and a painful red eye with discharge usually signals infection or a more severe keratitis rather than a noninfectious toxic reaction. So the combination of a foreign body sensation and photophobia best indicates corneal toxicity from lens wear.

Corneal toxicity from contact lenses mainly involves disruption of the corneal epithelium, so the most telling signs are a foreign body sensation and photophobia. When the corneal surface is irritated, the nerves there trigger a gritty, scratchy feeling and sensitivity to light, reflecting surface disruption and nerve irritation. Itching, by contrast, points more to conjunctival irritation or allergy rather than direct corneal injury. Tearing can occur with irritation but isn’t specific to corneal toxicity, and a painful red eye with discharge usually signals infection or a more severe keratitis rather than a noninfectious toxic reaction. So the combination of a foreign body sensation and photophobia best indicates corneal toxicity from lens wear.