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Progressive external ophthalmoplegia
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Progressive external ophthalmoplegia

Progressive external ophthalmoplegia is a genetic mitochondrial disorder characterized by the slowly worsening weakness of the muscles that control eye movement, often accompanied by general muscle weakness.

Overview and Symptoms

Progressive external ophthalmoplegia is a condition characterized by weakness of the eye muscles. The condition typically appears in adults between ages 18 and 40 and slowly worsens over time.

The first sign of progressive external ophthalmoplegia is typically drooping eyelids (ptosis), which can affect one or both eyelids. As ptosis worsens, affected individuals may use the forehead muscles to try to lift the eyelids, or they may lift up their chin in order to see.

Another characteristic feature of the condition is weakness or paralysis of the muscles that move the eye (ophthalmoplegia). Affected individuals have to turn their head to see in different directions, especially as the ophthalmoplegia worsens.

People with progressive external ophthalmoplegia may also experience:

  • General weakness of the muscles used for movement (myopathy), particularly those in the neck, arms, or legs. This weakness may be especially noticeable during exercise (exercise intolerance).
  • Difficulty swallowing (dysphagia).
  • Abnormal muscle cells containing an excess of cell structures called mitochondria

Frequently Asked Questions

No drug has proven disease‑modifying benefit for PEO. Some clinicians trial Coenzyme Q10, riboflavin, or creatine because they support mitochondrial function, but evidence is anecdotal. Any supplement should be discussed with a neurologist to avoid interactions and to set realistic expectations.
Rapid worsening is suggested by new inability to move the eyes in a particular direction, sudden double vision, or the need to turn the head dramatically to look sideways. If these changes occur over weeks rather than months, or if they are accompanied by new neck weakness, swallowing difficulty, or respiratory strain, seek immediate neurologic or ophthalmologic assessment.
Beyond eye findings, watch for generalized muscle fatigue, difficulty climbing stairs, swallowing problems, or unexplained weight loss. If you develop these, a referral to a neuromuscular specialist, speech‑language pathologist, or physical therapist is advisable. Routine cardiac and endocrine screening is not routinely required but may be considered if symptoms arise.
Ptosis surgery (levator resection or frontalis sling) can improve lid elevation, but results may be limited because the levator muscle often continues to weaken. A frontalis sling that uses the forehead muscle to lift the lid tends to be more durable in PEO. Patients should be counseled that additional procedures may be needed over time and that surgery does not halt disease progression.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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