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Sankara Nethralaya
Sankara Nethralaya
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Electro Diagnostics

1. Full field Electroretinography (ERG): Test which measures the electrical responses of various cell types in the retina, including the photoreceptors (rods and cones), inner retinal cells (bipolar and amacrine cells). Used to diagnose various retinal degenerations.

  Retinitis pigmentosa and their variants
  X-linked juvenile retinoschisis
  Heredo-macular degenerations
  Retinal Vascular occlusions
  Intraocular Foreign Body
2. Multifocal Electroretinography (mfERG): Multifocal electroretinography (mfERG) is a valuable technique in assessing macular function in retinal disease objectively. It is used to record separate responses for different retinal locations. It is also used in the detection of
  Macular dystrophies
  Macular hole
  X-linked retinoschisis
  Drug toxicity
  Multifocal choroditis
  White-dot syndrome
3. Electrooculogram (EOG): This is used to assess the function of the outer retina and Retinal Pigment Epithelium (RPE). EOG is used to confirm
  Best disease
  Suspected drug toxicities
4. Pattern Electroretinogram (PERG): This test provides information about central macular and retinal ganglion cell layer. It is also used to differentiate vision loss due to retinal or optic nerve diseases. PERG is used in evaluating
  Glaucoma and ocular hypertension,
  Optic neuritis other optic neuropathies,
5. Visually Evoked Responses (VEP): The VEP is a test to detect problems with the optic nerve and lesions in the anterior part of our visual pathway. VEP tests are used to evaluate
  Optic neuritis,
  Compressive Optic neuropathy,
  Toxic amblyopia
  Cortical Blindness
  Demyelenating diseases such as multiple sclerosis.
  Unexplained visual loss
6. Multifocal Visually Evoked Responses (mfVEP): This test allows for topographical assessment of visual field. In this test multiple individual VEP responses are recorded simultaneously from 60 or so regions of the central 20 to 25° radius of the visual field. This is also known as objective visual field perimetry. Indications are
  Diagnosing and Following of Optic Neuritis/Multiple Sclerosis
  Unexplained visual loss
  Detecting and following of Glaucomatous damage
  Confirming unreliable or questionable fields