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Genetic Testing for Eye Conditions

DNA testing to diagnose inherited conditions affecting vision, including LHON and dominant optic atrophy.

2 min read

Genetic testing analyzes DNA to identify mutations that cause inherited eye conditions. It can support or confirm diagnoses in many cases, guide treatment, and inform family counseling.

Key Takeaways

  • Can identify disease-causing variants in inherited conditions like LHON and DOA
  • Blood or saliva sample required
  • Results may take weeks
  • Important for family counseling
  • Guides treatment for some conditions

Conditions Diagnosed by Genetic Testing

Leber Hereditary Optic Neuropathy (LHON)

  • Mitochondrial DNA mutations
  • Three common mutations cover ~95% of cases
  • Blood test
  • Important for treatment decisions (idebenone)

Dominant Optic Atrophy (DOA)

  • OPA1 gene mutations most common
  • Autosomal dominant inheritance
  • Important for family screening

Retinal Dystrophies

Other Conditions

What to Expect

Sample Collection

  • Blood draw (most common)
  • Saliva sample (some tests)
  • Cheek swab

Timeline

  • Results typically 2-6 weeks
  • Complex panels may take longer

Counseling

  • Pre-test counseling explains implications
  • Post-test counseling interprets results
  • Genetic counselor involvement helpful

Implications of Results

Positive Result

  • Supports or confirms the diagnosis, depending on the variant and clinical picture
  • Guides treatment if available
  • Family members may be tested
  • Reproductive counseling available

Negative Result

  • Doesn't always rule out genetic cause
  • Some mutations not yet discovered
  • Clinical diagnosis still valid

Considerations

  • Insurance implications
  • Privacy concerns
  • Family member implications
  • Emotional impact
  • Discuss with genetic counselor
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