Which sign is classically described as vermiform movement of the iris?

Which sign is classically described as vermiform movement of the iris?

• A. Tonic Pupil
• B. Adie's Pupil
• C. Argyll Robertson Pupil
• D. Horner's Syndrome

Answer: (A)

Vermiform movement of the iris is worm-like, irregular waviness of the iris margin that happens when the iris sphincter is denervated and contracts in a patchy, uncoordinated way. This finding points to a tonic pupil, which results from loss of parasympathetic input to the sphincter muscle. Adie’s pupil is a common example of a tonic pupil, so the sign fits that broader pattern. The other conditions produce different pupil signs (for example, Horner’s shows a small, miosed pupil with ptosis and anisocoria; Argyll Robertson lacks such irregular iris movement).

Vermiform movement of the iris is worm-like, irregular waviness of the iris margin that happens when the iris sphincter is denervated and contracts in a patchy, uncoordinated way. This finding points to a tonic pupil, which results from loss of parasympathetic input to the sphincter muscle. Adie’s pupil is a common example of a tonic pupil, so the sign fits that broader pattern. The other conditions produce different pupil signs (for example, Horner’s shows a small, miosed pupil with ptosis and anisocoria; Argyll Robertson lacks such irregular iris movement).