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Electroretinogram (ERG)
Patient Guide and Instructions for ERG Testing
The ERG (Electroretinogram) is a diagnostic test, which involves recording the eye's electrical response to a flash of light by measuring the function of the cells in the retina. The test will provide information about the function of the rods and cones in the retina (the back of the eye) both in the dark and light. The ERG is performed under general anesthesia on children under 12 years of age. Most children over 12 years old will not require anesthesia.

What to Expect on Test Day
Prior to the test, eye drops will be used for dilation, small eye patches will cover the eyes, and the patient will be required to sit in a dark room for 30-45 minutes.

How the Test is Performed
The ERG response is recorded through a small contact lens electrode placed on the surface of the eye. Flashes of light are emitted and an electrical response is recorded. The test will take about one hour.

How to prepare for the Test
Pre-Register by calling .

If sedation or general anesthesia is required:

  • Obtain a history and physical from your primary care physician within the 30 days period before the scheduled test date.
  • Follow the fasting instructions given by the hospital according to the patient's age.
What to Expect after the Test
The patient will be taken to a post anesthesia area where the nurses will observe the patient until he or she is ready to go home.

Potential Risk
The ERG is a non-invasive test with low risks. The risks are limited to a possible corneal abrasion or an allergic reaction to eye drops.

Indications for Testing

  • Ushers Syndrome
  • Retinal Dystrophy
  • Leber's Congenital Amaurosis
  • Nystagmus
  • Nystagmoid Eye Movements
    • Retinal Dystrophy
    • Neuroblastoma
  • Pigmentary Retinal Abnormalities
    • Retinal Dystrophy
    • Toxoplasmosis
  • Batten Disease
  • Retinitis Pigmentosa and other forms of Night Blindness
Traveling from Outside Jacksonville?
If traveling from out of town, you may wish to check on overnight accommodations at the Ronald McDonald House located near Wolfson Children's Hospital.

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