H40.212 Acute angle-closure glaucoma, left eye

Name of the Condition

• Acute Angle-Closure Glaucoma, Left Eye

Summary

Acute angle-closure glaucoma, left eye, is a sudden, severe form of glaucoma characterized by rapid closure of the left eye's drainage angle, leading to a rapid increase in intraocular pressure. This condition can cause significant pain, vision loss, and optic nerve damage if not treated promptly. It is a medical emergency requiring immediate intervention to prevent permanent vision impairment in the left eye.

Causes

The primary cause is a sudden blockage of the left eye's drainage angle, often due to anatomical factors such as a thickened or forward-positioned lens. This blockage prevents aqueous humor from draining, causing intraocular pressure to rise rapidly. Contributing factors may include pupil dilation, inflammation, or structural abnormalities in the eye's anterior segment.

Risk Factors

• Anatomically narrow drainage angles in the left eye.
• Farsightedness (hyperopia).
• Age over 40.
• Family history of glaucoma.
• Asian or Inuit descent.
• Certain medications that dilate the pupil.
• Previous episodes of angle closure.

Symptoms

• Severe eye pain or headache in the left eye.
• Blurred vision in the left eye.
• Halos around lights in the left eye.
• Nausea or vomiting.
• Redness in the left eye.
• Sudden loss of vision in the left eye.

Diagnosis

Diagnosis involves a comprehensive eye examination, including tonometry to measure intraocular pressure, gonioscopy to assess the drainage angle, and optical coherence tomography to evaluate anterior segment structures. Visual field testing and optic nerve imaging may also be performed to assess damage.

Treatment Options

Treatment focuses on rapidly lowering intraocular pressure through medications (e.g., topical or systemic agents) and procedures such as laser iridotomy or iridectomy. In severe cases, surgical intervention may be necessary. Long-term management may include medications to prevent recurrence.

Prognosis and Follow-Up

With prompt treatment, vision loss can often be minimized, but some damage may be irreversible. Follow-up care is essential to monitor intraocular pressure, optic nerve health, and prevent future episodes. Regular eye examinations are recommended to assess for chronic changes or recurrence.

Complications

Untreated acute angle-closure glaucoma can lead to permanent vision loss, optic nerve damage, or blindness in the left eye. Recurrent episodes may increase the risk of chronic angle-closure glaucoma.

Lifestyle & Prevention

Avoid triggers that dilate the pupil (e.g., certain medications or low lighting). Regular eye exams can help identify narrow angles early. Discuss risk factors with an eye care provider to determine preventive measures, such as laser treatment.

When to Seek Professional Help

Seek immediate medical attention if experiencing severe eye pain, blurred vision, halos around lights, or sudden vision loss in the left eye. These symptoms require urgent evaluation to prevent permanent damage.

Tips for Medical Coders

Use H40.212 for acute angle-closure glaucoma affecting the left eye. Document laterality clearly and confirm the acute nature of the condition. Ensure clinical documentation supports the diagnosis and any associated procedures or treatments.