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Electroretinography is a test to measure the electrical response of the eye's light-sensitive cells, called rods and cones.
Alternative NamesERG
How the test is performedWhile you are comfortably seated in a chair, the health care provider places numbing drops into your eyes, so you do not feel pain during the test. Your eyes are then propped open and an electrical sensor (electrode) is placed on each eye.
The electrode measures the electrical activity of the retina in response to light. A light flashes, and the electrical response travels from the electrode to a TV-like screen, where it can be viewed and recorded. The normal response pattern has waves called A and B.
The doctor will take the readings in normal room light and then again in the dark, after allowing 20 minutes for your eyes to adjust.
How to prepare for the testNo special preparation is necessary for this test.
How the test will feelThe probes that rest on your eye may feel like an eyelash. The test takes about one hour to perform.
Why the test is performedThis test is done to detect disorders of the retina. It is also useful in determining if retinal surgery is recommended.
Normal ValuesNormal test results will show a normal A and B pattern in response to each flash.
What abnormal results meanThe following conditions may cause abnormal results:
- Arteriosclerosis
- Congenital night blindness
- Congenital retinoschisis
- Giant cell arteritis
- Iron poisoning
- Mucopolysaccharidosis
- Retinal detachment
- Rod-cone dystrophy (retinitis pigmentosa)
- Vitamin A deficiency
The cornea may get a superficial scratch from the electrode. Otherwise, there are no risks associated with this procedure.
Special considerationsYou should not rub your eyes for an hour after the test, as this could injure the cornea. Your doctor will discuss with you the results of the test and what it means for you.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoElectroretinography is a test to measure the electrical response of the eye's light-sensitive cells, called rods and cones. These cells are part of the retina (the back part of the eye).
Alternative NamesERG; Electrophysiologic testing
How the test is performedWhile you are in a sitting position, the health care provider places numbing drops into your eyes, so you will not have any discomfort during the test. Your eyes are held open with a small device called a retractor. An electrical sensor (electrode) is placed on each eye.
The electrode measures the electrical activity of the retina in response to light. A light flashes, and the electrical response travels from the electrode to a TV-like screen, where it can be viewed and recorded. The normal response pattern has waves called A and B.
The doctor will take the readings in normal room light and then again in the dark, after allowing 20 minutes for your eyes to adjust.
How to prepare for the testNo special preparation is necessary for this test.
How the test will feelThe probes that rest on your eye may feel a little scratchy. The test takes about 1 hour to perform.
Why the test is performedThis test is done to detect disorders of the retina. It is also useful in determining if retinal surgery is recommended.
Normal ValuesNormal test results will show a normal A and B pattern in response to each flash.
What abnormal results meanThe following conditions may cause abnormal results:
- Arteriosclerosis with damage to the retina
- Congenital night blindness
- Congenital retinoschisis (splitting of the retinal layers)
- Giant cell arteritis
- Medications (chloroquine, hydroxychloroquine)
- Mucopolysaccharidosis
- Retinal detachment
- Rod-cone dystrophy (retinitis pigmentosa)
- Trauma
- Vitamin A deficiency
The cornea may get a temporary scratch on the surface from the electrode. Otherwise, there are no risks with this procedure.
Special considerationsYou should not rub your eyes for an hour after the test, as this could injure the cornea. Your doctor will discuss with you the results of the test and what it means for you.
ReferencesOdom JV, Leys M, Weinstein GW. Clinical visual electrophysiology. In: Tasman W, Jaeger EA, eds. Duane's Ophthalmology. 15th ed. Philadelphia, Pa: Lippincott Williams & Wilkins;2009:chap 5.
Cleary TS, Reichel E. Electrophysiology. In: Yanoff M, Duker JS, eds. Ophthalmology. 3rd ed. Maryland Heights, Mo: Mosby Elsevier;2008:chap 6.9.
Reviewed ByReview Date: 08/12/2010
David C. Dugdale, III, MD, Professor of Medicine, Division of Medicine, Department of Medicine, University of Washington School of Medicine; and Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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What does electroretinography mean?
Electroretinography (ERG) is an eye test used to detect abnormal function of the retina (the light-detecting portion of the eye).
What has the author Peep Algvere written?
Peep Algvere has written: 'Studies on the oscillatory potentials of the clinical electroretinogram' -- subject(s): Electroretinography
How is Retinitis Pigmentosa Diagnosed?
As RP is a genetic disorder, your doctor may do a number of tests to make sure that you are given the right treatment. They include: OCT or Optical Coherence Tomography, which is a test that takes highly detailed pictures of the retina Genetic Testing, where a blood sample or a tissue sample might be taken to study your genes to determine the extent of the disease as well as the course of action Electroretinography is a test that measures the electrical activity and checks the reaction of the Retina to light. Visual Field Testing helps check your peripheral vision and blind spots. Every case of Retinitis Pigmentosa is different and doctors may want to do multiple tests to make sure they have caught the extent and severity of the disease. Doctors at Sanjeevan Netralaya understand that every patient is different with different genes and understand the patient history before prescribing effective Ayurvedic Medication that is not only effective but also causes absolutely no side effects.
Your 6 year old son has been diagnosed with RP and already has night blindness. What are the next stages and what can be expected in the future?
Retinitis pigmentosa (RP) begins with the loss of night vision. As things progress, peripheral vision will deteriorate resulting in tunnel vision. Vision will continue to deteriorate until an affected individual is legally blind. The only question is how fast this will occur. An eye care professional who administers a test called electroretinography (ERG) along with something to assess the dimensions of the visual field will be able to chart the course of the deterioration of vision. Naturally, the professional will have to perform the tests several times with an interval between tests. By mapping the test results, a curve can be constructed that makes some projections as to how fast vision is failing. Rates of progression vary, as one might expect. Look into a vitamin A supplement and spool up (get up to speed) on the particulars of this genetic condition. A posting here demonstrates computer and web access. Use the web. Support groups exist. If not local ones, they can be found on the net. Partner with a good medical professional if you don't have one so regular testing can be conducted and all your questions can be answered by an expert in the field. Best of luck sorting things out now and into the future. Use the link and skim the article posted by our friends at Wikipedia. Be sure to scroll down to the bottom and hit the links there. Quite a few are posted.
How do you get an A in Human Anatomy?
STUDY OF HUMAN PHYSIOLOGY The beginning of the study of human physiology takes place right from the time of conception, though unconsciously. Consciously the study begins with learning of the interactions amongst family members and the living and non living surroundings. But this study is informal or non-formal. Formal and conscious learning of human physiology begins when one starts going to school. Here a variety of interactions in the nature are taught with respect to their effects on human life. This knowledge is sometimes categorized as human physiology and sometimes not. The professoinal or academic study of human physiology begins when one enters a graduation or professional course. The foundation of the study of human physiology is to get oriented to the fact that you are going to study everything in nature with respect to its effects on human life. (The study of the effects of the human life on the nature constitutes the various arts, languages, politics, religions and so on.) Thus to begin with, we study the structure and then functioning of these structures and their interactions in following way. 1. We observe signs and symptoms in patients and correlate them with the structural and functional abnormalities. 2. We use observations in day to day life and correlate their cause and effect e.g. the effect of day night on sleep and wakefulness cycle. 3. We use the knowledge of physics, chemistry etc and apply the principles involved to the human body to explain the interactions in human body. 4. We use technology such as microscope to study smaller structures such as cells, their membranes etc. 5. The actual events (phenomena) in the body are compared with other observed events (phenomena) such as electricity in the nature and thus the nature of the body activities are defined. 6. The various control mechanisms in the machines are correlated with body and the nature of regulatory and control mechanisms in the body are identified or hypothesized and verfied. 7. Experimentation such ablation (removal) of an organ and its effects are observed and correponding function is assigned to that organ. 8. Stimulation experiments withb rain elicit functions of organs related to that part of brain. 9. Observations of effects of practice of pranamaya, different exercises and other alterations in the environment or diet add to our knowledge of human physiology. 10. Various measurements such as hemoglobin, pulmonary ventillation, blood pressure are also important. 11. Techniques such electrocardiography, electroencephalography, electroretinography give quantitative perspective of corresponding structures their functions. 12. Based on these and other studies and observations, one learns to make hypotheses and learn to verify them and make the understanding of human physiology deeper and more accurate. 13. Learning human physiology can not grow without asking questions at every point. 14. Learning human physiology requires (like any other field) unprejudiced and realistic mind. It is said that various techniques can be used to develop crystal clear and unselfish mind, which facilitates effective learning of human physiology.
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