Electroretinography, often referred to as an electroretinogram, is a test that analyzes the electrical response of the light-sensitive cells in the eyes. Rods and cones are the names given to these cells. They are a structural component of the retina.
The cones in the eye are controlled for color sensitivity. They are mainly found in the macula of the eye. Although rods are more reactive to light unlike cones, they are not as color sensitive.
Why Do You Need An Electroretinography Test?
Electroretinography may be used by your doctor to identify if you have a hereditary or acquired retinal condition, such as:
- Retinitis pigmentosa
- Macular degeneration
- Cone-rod dystrophy
- Retinoblastoma
- Retinal separation
What Happens During An Electroretinography Test?
During electroretinography:
- The doctor will tell you to lay or sit comfortably.
- They typically dilate your pupils with eye drops before the exam.
- If your doctor places an electrode directly on your eye, anesthetic drops will be put in your eyes to make them numb.
- They’ll use a device called a retractor to keep your eyelids open. This will allow them to implant a tiny electrode on each eye with care.
- Your doctor will place another electrode on your skin that will act as a ground for the retina’s feeble electrical signals.
- After that, you’ll see a flashing light. Your doctor will do the test in both natural light and a darkened environment. The electrode allows the doctor to assess the electrical reaction of your retina to light.
- The data from the electrodes is shown and recorded on a monitor. t appears as a-waves (positive) and b-waves (negative). After that, your doctor will be able to see how your eye reacts to light.
What Will Happen After The Test?
After the exam, your eyes might be sensitive. So, you must avoid touching your eyes for approximately an hour. Since the corneas are still numb from the anesthesia, this could result in corneal injury.
Your physician will explain the results with you. They may request further testing to evaluate your eye. A surgery may be required for conditions such as retinal detachment or trauma.
