Which one of the following ocular signs is NOT seen in Horner’s syndrome? (Answer below)

Exophthalmos is not an ocular sign in Horner’s syndrome.
What about heterochromia?
Heterochromia may be found in different conditions, including congenital and acquired Horner’s syndrome.
A unilateral lack of sympathetic stimulation during childhood interferes with the melanin pigmentation of the melanocytes in the iris, resulting in heterochromia.