A big corneal ulcer with no pain is most likely associated with which corneal finding?

• A. Recurrent corneal erosion
• B. Acanthamoeba keratitis
• C. Scleromalacia perforans
• D. Neurotrophic keratopathy

Answer: (D)

Loss of corneal sensation and trophic support leads to neurotrophic keratopathy, which presents as a large corneal ulcer that is surprisingly painless. When the cornea loses its sensory nerves, pain signaling is blunted and protective reflexes (like blinking and tearing) are reduced, while epithelial maintenance and healing are impaired. This combination allows a substantial ulcer to develop and persist without the usual painful response.

Neurotrophic keratopathy often arises from trigeminal nerve impairment due to prior herpes zoster ophthalmicus or other herpetic keratitis, diabetes, CNS disease, or ocular surgery. On exam you’d expect reduced corneal sensation and a diminished corneal reflex, with poor epithelial healing and sometimes stromal thinning, even though the patient reports little or no pain.

Other conditions typically cause pain with corneal involvement—recurrent corneal erosion is painful upon epithelial breakdown, and acanthamoeba keratitis usually presents with severe pain and a distinctive clinical picture. Scleromalacia perforans involves scleral thinning rather than a primary painful corneal ulcer.