Corneal blood staining is a condition in which hemosiderin, a breakdown product of red blood cells, deposits in the corneal stroma after hyphema, causing the cornea to become yellowish-brown to reddish-brown and opaque.
Hyphema is the presence of blood in the anterior chamber after blunt trauma, with blunt or penetrating trauma being the most common cause 1). Complications of hyphema include elevated intraocular pressure, iris dialysis, angle recession, corneal blood staining, vitreous hemorrhage, and lens subluxation or dislocation. Even a small hyphema can lead to complications such as glaucoma, corneal blood staining, and secondary hemorrhage, so appropriate management is important 1).
The annual incidence of hyphema presenting to the emergency department is relatively rare at approximately 0.52 per 100,000, and the majority are young males 1). In addition to traumatic hyphema, causes include after minimally invasive glaucoma surgery (MIGS) and hemorrhagic persistent fetal vasculature (PFV).
QDoes hyphema always lead to corneal blood staining?
A
Most hyphemas are spontaneously absorbed within one week and do not progress to corneal blood staining 1). The development of corneal blood staining involves risk factors such as sustained elevation of intraocular pressure, rebleeding, and corneal endothelial dysfunction (see Risk Factors and Causes).
Decreased vision: Proportional to the amount of blood in the anterior chamber, ranging from blurred vision to severe vision loss 1). If corneal blood staining occurs, vision loss is further prolonged.
Pain: Patients experience eye pain associated with increased intraocular pressure1).
Photophobia: Sensitivity to light increases due to inflammation in the anterior chamber1).
Redness: Conjunctival and scleral injection is observed.
In total hyphema (Grade IV), the anterior chamber appears red to dark brown, resembling the black 8-ball in billiards (8-ball hyphema).
When corneal blood staining occurs, dense yellowish-brown to reddish-brown pigmentation is seen in the corneal stroma2). Clearing of the opacity progresses centripetally from the periphery (near the limbus) toward the center2). Spontaneous resolution usually takes 2 to 3 years2).
Factors that increase the risk of developing corneal blood staining are as follows.
Prolonged hyphema: Persistence for more than 6 days is high risk.
Total hyphema (Grade IV): Large amount of blood contacts the cornea for a long time.
Corneal endothelial dysfunction: Reduced barrier function of the endothelium allows hemoglobin to penetrate more easily2).
Persistent elevated intraocular pressure: If pressure remains above 25 mmHg for 6 days, the risk increases significantly.
Descemet membrane damage: In the presence of Haab striae (Descemet membrane rupture associated with congenital glaucoma), corneal blood staining can occur even with normal intraocular pressure2).
Rebleeding: Rebleeding occurs in up to 38% within one week after initial injury1), and is often more severe than the first episode. According to EGS guidelines, rebleeding occurs on days 3 to 7, with an incidence of 5–10%3).
In patients with sickle cell disease or sickle cell trait, sickled red blood cells increase trabecular meshwork obstruction, leading to a higher risk of secondary glaucoma and corneal blood staining regardless of the severity of hyphema1). Screening for sickle cell disease is recommended in patients of African descent1).
QDoes sickle cell disease increase the risk of corneal blood staining?
A
Yes. Sickled red blood cells have low deformability and easily obstruct the trabecular meshwork, so even a small hyphema can cause elevated intraocular pressure, lowering the threshold for surgical intervention such as anterior chamber washout1). Carbonic anhydrase inhibitors and hyperosmotic agents should be avoided as they promote sickling3).
Slit-lamp examination: Essential for confirming and classifying hyphema; also assesses for corneal blood staining 1). Microhyphema is difficult to detect with the naked eye and requires slit-lamp observation.
Intraocular pressure measurement: Elevated intraocular pressure associated with hyphema is the most common complication 1), and regular measurement is essential.
Gonioscopy: Useful for detecting angle recession or post-traumatic structural changes, but should be avoided for 1–2 weeks after injury due to the risk of rebleeding 3).
Seidel test: Confirms the presence of corneal perforation.
Sickle cell screening: In patients of African descent, screening is recommended to guide management of hyphema1).
Imaging (CT/MRI): If severe conjunctival edema, hypotony, or subconjunctival hemorrhage is present, suspect globe rupture and perform imaging. MRI is contraindicated if a metallic foreign body is suspected.
The most important aspect of treating corneal blood staining is preventing its occurrence through management of hyphema. Most hyphemas resolve spontaneously, but appropriate medical and surgical intervention is necessary to prevent complications.
Medical Treatment
Positioning: Avoid supine position; keep the patient sitting or elevate the head of the bed 30–45 degrees to allow blood to settle in the inferior anterior chamber and reduce trabecular meshwork obstruction.
Mydriatics: Atropine 1% ophthalmic solution once daily at bedtime. Used to prevent posterior synechiae and relieve ciliary muscle spasm 1).
Steroids: Rinderon ophthalmic solution 0.1% four times daily. Effective for suppressing inflammation and preventing secondary hemorrhage 1).
Hemostatic agents: Adona tablets 30 mg, 3 tablets, divided into three doses after each meal.
Anterior chamber washout: Indicated when intraocular pressure elevation persists or signs of corneal blood staining are present 1)3). The optimal timing is around 4 days after injury.
Acceptable intraocular pressure criteria: In healthy young individuals, 50 mmHg for 5 days, 35 mmHg for 7 days.
Sickle cell disease: Consider anterior chamber washout if intraocular pressure is elevated for more than 24 hours 1).
Other surgical procedures: Trabeculectomy, peripheral iridectomy, anterior chamber paracentesis1). All carry a risk of rebleeding.
Tranexamic acid and aminocaproic acid promote coagulation and reduce the risk of rebleeding 1)3). Anticoagulants, antiplatelet agents, NSAIDs, and aspirin promote rebleeding and should be discontinued 1).
Once corneal blood staining occurs, spontaneous resolution is slow. Opacity clears centripetally from the periphery to the center, and complete resolution usually takes 2–3 years 2). In children, prolonged opacity of the visual axis carries a risk of deep amblyopia2), and early corneal transplantation is an option, but pediatric corneal transplantation has issues with graft survival 2).
QWhat is the optimal timing for anterior chamber washout?
A
The appropriate timing is around day 4 after injury. At this point, the risk of rebleeding is reduced, and the blood clot has partially separated from the ocular tissues. Surgery should be considered before intraocular pressure elevation of 25 mmHg or more persists for 6 days, or when the first signs of corneal blood staining appear.
When blunt force is applied to the eye, intraocular pressure rises rapidly, causing stretching of the limbus and posterior displacement of aqueous humor. This damages the iris and ciliary body, leading to bleeding. Rupture of the recurrent choroidal artery or the major arterial circle of the iris causes blood to flow into the anterior chamber1).
Red blood cells retained in the anterior chamber break down, and their products penetrate the cornea. Initially, extracellular hemoglobin deposits in the corneal stroma. Granules of red blood cell breakdown products pass through the discontinuous corneal endothelium and intact Descemet’s membrane to reach the corneal stroma.
Hemoglobin accumulates extensively in keratocytes, and granules of hemosiderin and ferritin appear. Persistent hemoglobin overload leads to keratocyte necrosis, resulting in irreversible corneal blood staining.
Corneal Blood Staining with Descemet’s Membrane Damage and Low Intraocular Pressure
Corneal blood staining usually occurs with hyphema accompanied by elevated intraocular pressure, but if there is a rupture in Descemet’s membrane (such as Haab’s striae), the endothelial barrier function is compromised, so it can occur even with low intraocular pressure2). Corneal endothelial dysfunction is an important factor facilitating hemoglobin penetration into the corneal stroma2).
Glaucoma associated with hyphema has multiple mechanisms.
Trabecular meshwork obstruction by red blood cells and inflammatory debris: This is the most common mechanism 1).
Hemolytic glaucoma: Hemoglobin-laden macrophages and red blood cell fragments impair trabecular meshwork function 3).
Ghost cell glaucoma: Red blood cells trapped in the vitreous for several weeks degenerate, becoming spherical khaki-colored cells with denatured hemoglobin (Heinz bodies) deposited on the inner cell wall 3). These cells have low deformability and difficulty passing through the trabecular meshwork, causing elevated intraocular pressure. Communication between the vitreous and anterior chamber via disruption of the anterior hyaloid face is a prerequisite for development.
QCan corneal blood staining occur even with normal intraocular pressure?
A
This can occur. There is a report of corneal blood staining developing in a case with Haab striae (Descemet membrane rupture) associated with congenital glaucoma, despite an intraocular pressure of 9 mmHg after postoperative hyphema2). When corneal endothelial dysfunction or Descemet membrane damage is present, there is a risk of development even without elevated intraocular pressure.
7. Latest Research and Future Perspectives (Investigational Reports)
Atallah et al. (2025) reported a case of a 4-month-old male infant with Haab striae associated with bilateral congenital glaucoma2). After circumferential trabeculotomy, hyphema occurred, and corneal blood staining developed 2 weeks postoperatively despite a low intraocular pressure of 9 mmHg. The opacity partially resolved over 20 months, but deep amblyopia remained. This report suggests that Descemet membrane rupture and corneal endothelial dysfunction are independent risk factors for corneal blood staining.
Promotion of Corneal Blood Staining Resolution with Iron Chelators
In the report by Atallah et al. (2025), it is mentioned that oral deferiprone (a systemic iron chelator) may promote the removal of iron deposits derived from hemoglobin and contribute to improvement in corneal transparency 2). However, it was not used in that case, and future clinical validation is needed.
Evaluation of Corneal Remodeling Using Anterior Segment OCT
Anterior segment OCT has been reported to show a hyperreflective thickened line at the level of Descemet membrane, reflecting the healing process of Descemet membrane rupture 2). Its usefulness as a noninvasive imaging tool for evaluating remodeling after corneal blood staining is noteworthy.
Angle recessionglaucoma is a long-term complication of traumatic hyphema. In cases with angle recession of 180 degrees or more, the incidence is high at 6–20% over 10 years, and onset often occurs several years or more after injury, so long-term follow-up is important.
Chen EJ, Fasiuddin A. Management of Traumatic Hyphema and Prevention of Its Complications. Cureus. 2021;13(6):e15771.
Atallah EA, Alalawi SM, Alhendi SH, et al. A Rare Case of Early Corneal Blood Staining After Post-operative Hyphema in a Child With Congenital Glaucoma and Haab’s Striae. Cureus. 2025;17(11):e97269.
European Glaucoma Society. European Glaucoma Society Terminology and Guidelines for Glaucoma, 5th Edition. Br J Ophthalmol. 2025. doi:10.1136/bjophthalmol-2025-egsguidelines.
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