Adapted from a WikiMedia Commons Public Domain Gray's Anatomy image.

Orbicularis oculi muscle is located in the eyelids and runs circumferentially around the eye opening (palpebral aperture). The primary function is eyelid closure.

• Use fluorescein eye drops to look for corneal abrasion
• Look for conjunctival haemorrhage (below)
• Check the pupil shape and reaction to light
• Use an ophthalmoscope to ensure there is a clear view of the retina

Source: EyeRounds.org. Contributor: Jordan M. Graff, MD, University of Iowa.

Subconjunctival haemorrhage following eye trauma.

• Ask if patient has 'double vision' as orbital fractures often cause diplopia
• Test for orbital fracture by feeling the orbit margin
• Test eye movements (an orbital floor 'blowout' fracture can trap the inferior rectus and restrict elevation)
• Look for enophthalmos (sunken eye) due to prolapse of orbital tissue into maxillary antrum, which can be subtle
• Test for numbness below the orbital margin, as the infraorbital nerve can be damaged with an orbital floor fracture