Which testing is used in Bell palsy to assess corneal protection and tear film stability?

Which testing is used in Bell palsy to assess corneal protection and tear film stability?

• A. Sodium fluorescein and tear break-up time
• B. CT scan
• C. Visual acuity
• D. Intraocular pressure

Answer: (A)

Bell palsy can cause incomplete eyelid closure and reduced blinking, which increases corneal exposure and the risk of drying and epithelial damage. To gauge how well the cornea is protected and how stable the tear film is, clinicians use fluorescein staining to highlight any corneal epithelial surface irregularities and pair it with tear break-up time, which measures how quickly the tear film disintegrates after a blink. If fluorescein shows epithelial staining and the tear break-up time is shortened, it indicates compromised corneal protection and tear film instability, signaling a higher risk of exposure keratopathy in this context. Other tests don’t specifically evaluate the tear film or corneal surface in the setting of eyelid closure weakness: CT scans assess anatomy, not surface protection; visual acuity tests how clearly the eye sees but not surface integrity; intraocular pressure gauges eye pressure, not tear film stability.

Bell palsy can cause incomplete eyelid closure and reduced blinking, which increases corneal exposure and the risk of drying and epithelial damage. To gauge how well the cornea is protected and how stable the tear film is, clinicians use fluorescein staining to highlight any corneal epithelial surface irregularities and pair it with tear break-up time, which measures how quickly the tear film disintegrates after a blink. If fluorescein shows epithelial staining and the tear break-up time is shortened, it indicates compromised corneal protection and tear film instability, signaling a higher risk of exposure keratopathy in this context. Other tests don’t specifically evaluate the tear film or corneal surface in the setting of eyelid closure weakness: CT scans assess anatomy, not surface protection; visual acuity tests how clearly the eye sees but not surface integrity; intraocular pressure gauges eye pressure, not tear film stability.