Left Horner syndrome.

Note the anisocoria (right pupil larger than left pupil) suggesting miosis of the left pupil. There is left upper lid ptosis and a very slight left lower lid ptosis, consistent with paralysis of the Müller and inferior tarsal muscles, respectively. There is also some mild increased conjunctival injection in the left eye, which can occur due to the disruption of sympathetic innervation to the periocular blood vessels.

Image credit: American Academy of Ophthalmology. Used with permission for educational purposes.