Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Cocaine Testing for Horner Syndrome.
Notes: (A) Right Horner syndrome in a 72-year-old man. Note right ptosis and anisocoria with the smaller pupil on the right side. Both pupils reacted briskly to light stimulation. (B) After topical administration of 10% cocaine drops in both eyes, there is marked dilation of the left pupil but the right pupil dilates only very slightly. This response indicates that the patient has a right Horner syndrome.
