What ocular abnormality is included in the Hutchinson triad associated with congenital syphilis?

The Hutchinson triad is a classic sign associated with congenital syphilis, which includes three main features: notched incisors, sensorineural hearing loss, and interstitial keratitis. Interstitial keratitis is a specific ocular abnormality that arises due to the effects of congenital syphilis and is characterized by inflammation of the cornea, leading to scarring and potential vision impairment.

This form of keratitis is significant because it reflects the deep-seated infection that occurs in the corneal stroma, resulting in both visual complications and the potential for corneal deformity. The presence of interstitial keratitis in children with congenital syphilis is one of the key clinical findings used to diagnose the condition.

Other ocular abnormalities such as cataract, glaucoma, and retinopathy are not part of the Hutchinson triad linked specifically to congenital syphilis. While they can occur in various conditions, they do not have the direct association established with congenital syphilis and the classic triad of findings. Thus, interstitial keratitis is the correct answer because it is specifically highlighted as one of the ocular manifestations associated with Hutchinson's triad.