2020–2021 BCSC Basic and Clinical Science Course™
8 External Disease and Cornea
Chapter 14: Clinical Aspects of Toxic and Traumatic Injuries of the Anterior Segment
Concussive (Blunt) Trauma
Traumatic Mydriasis and Miosis
Traumatic mydriasis results from iris sphincter tears that can permanently dilate or otherwise alter the shape of the pupil (Fig 14-13). The iris tears may result in a hyphema. The pupil changes are generally permanent; patients should use sunglasses for resultant photophobia, as permanent surgical repair is less effective.
Miosis tends to be associated with anterior chamber inflammation (traumatic anterior uveitis; see the following section). Topical corticosteroid drops to reduce inflammation and cycloplegia to prevent formation of posterior synechiae are helpful in controlling symptoms.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.