To refer or not to refer for EDTs

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To refer or not to refer for EDTs?

• Dr Peter Good
• Consultant Clinical Scientist

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Why refer for EDTs?

• Unexplained visual loss
• Hereditary retinal dystrophy
• Nystagmus
• Visual Function in paediatrics
• Opaque Media
• Trauma
• Drug Toxicity

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Indications for EDT tests
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Unexplained visual loss
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Hereditary Retinal Dystrophy
Please dont ask for paediatric EDTs when
macular developed
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Nystagmus
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Visual Loss in Childhood
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Opaque Media
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Trauma

• Retinal or Optic Nerve Trauma?

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Drug Toxicity
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When not to request EDTs

• Choroidal, Macular off Retinal Detachments
• Cataract without RAPD
• Before MRI/CT
• Acute Optic Neuritis (VA lt 6/36), unless
  Functional
• EDTs in young children where family history of
  heredo-macular dystrophy
• If VA gt 6/9 in occlusion therapy

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How to request?

• By referral letter to
• Dr Peter Good
• Consultant Clinical Scientist
• Visual Function request card
• Clinically urgent EDTS to be discussed with Dr
  Good
• Do not routinely fax letters to us!

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We dont have a crystal ball!

• Please give all patient details
• Summary of ophthalmic findings
• Which is the affected eye
• Inform patient why they are attending