Electroretinography Center - Methuen, MA
Methuen Eye Doctor Doctors for ElectroretinographyType of Physician: Eye Doctor What is a Eye Doctor? A certification by the Board of Ophthalmology; practitioners provide comprehensive eye and vision care. They are trained to diagnose, monitor and medically or surgically treat all eyelid and orbital problems affecting the eye and visual pathways, and to diagnose, monitor and treat all eye and visual disorders. They often prescribe vision services (glasses and contact lenses) as well as serve as a consultant to physicians and other professionals. Specialty: Ophthalmology Common Name: Eye Doctor Eye Doctor Doctors in Methuen * Robert E Kellan MD  Macoul Eye Associates  Tallman Eye Associates  Tallman Eye Associates  Tallman Eye Associates  Tallman Eye Associates  Tallman Eye Associates  Tallman Eye Associates  Arrigg Eye & Ear Associates  Arrigg Eye & Ear Associates  Arrigg Eye & Ear Associates  Arrigg Eye & Ear Associates  Arrigg Eye & Ear Associates  Andover Eye Associates  Andover Eye Associates  Andover Eye Associates  Andover Eye Associates  Andover Eye Associates  Andover Eye Associates  Glenn P Kimball Jr. MD  Merrimack Eye Clinic  Massachusetts Eye Associates  Massachusetts Eye Associates  Massachusetts Eye Associates  Eye Associates PC  Eye Associates PC  Eye Associates PC  Eye Associates PC  Massachusetts Eye Associates  Stephen J Poor III MD PC  Massachusetts Eye Associates  Eye Associates PC  North Shore Ophthalmology  Eye Associates PC  Eye Associates PC  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Martin E Cutler MD  Martin E Cutler MD  North Suburban Eye Associates  North Suburban Eye Associates  North Suburban Eye Associates  Children's Hospital Boston Ophthalmology  Children's Hospital Boston Ophthalmology  Cornea Consultants  Family Eye Care Center  Lexington Eye Associates  Lexington Eye Associates  Lexington Eye Associates  Lexington Eye Associates  Lexington Eye Associates  Lexington Eye Associates  American Vision Association  Lexington Eye Associates  Lexington Eye Associates  Lexington Eye Associates  Lexington Eye Associates  Lexington Eye Associates  Lexington Eye Associates  Robert G Alexander MD  Northeast Eye Care  Horsley Eye Center  Ophthalmic Consultants Of Boston  Northeast Eye Care  North Shore Ophthalmology  Bernhard Heersink MD  Schepens Retina Associates  Microsurgical Eye Consultants  Microsurgical Eye Consultants  Microsurgical Eye Consultants  Schepens Retina Associates  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  New England Eye Consultants  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Lahey Clinic Medical Center Ophthalmology  Children's Hospital Boston Ophthalmology  Miriam Dougherty MD  Michael Olstein MD  Michael Wiedman MD & Jacquelyn Stevens MD  Michael Wiedman MD & Jacquelyn Stevens MD  Eye Care Consultants  Talamo Laser Eye Consultants  Jason N Gilbert MD  David M Guyette MD  Harvard Vanguard Medical Associates Somerville  Ernst Meyer MD  Harvard Vanguard Medical Associates Somerville  Retina Specialists of Boston Inc  Retina Specialists of Boston Inc  Retina Specialists of Boston Inc  Paul Barsam MD Methuen, MassachusettsUpcoming Local Events2012-05-26
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ElectroretinographyRead the Electroretinography article » What is electroretinography?Electroretinography (ERG) is an eye test used to detect abnormal function of the retina (the light-detecting portion of the eye). Specifically, in this test, the light-sensitive cells of the eye, the rods and cones, and their connecting ganglion cells in the retina are examined. During the test, an electrode is placed on the cornea (at the front of the eye) to measure the electrical responses to light of the cells that sense light in the retina at the back of the eye. These cells are called the rods and cones. How is an ERG done?The patient assumes a comfortable position (lying down or sitting up). Usually the patient's eyes are dilated beforehand with standard dilating eye drops. Anesthetic drops are then placed in the eyes, causing them to become numb. The eyelids are then propped open with a speculum, and an electrode is gently placed on each eye with a device very similar to a contact lens. An additional electrode is placed on the skin to provide a ground for the very faint electrical signals produced by the retina. During an ERG recording session, the patient watches a standardized light stimulus, and the resulting signal is interpreted in terms of its amplitude (voltage) and time course. This test can even be performed in cooperative children, as well as sedated or anesthetized infants. The visual stimuli include flashes, called a flash ERG, and reversing checkerboard patterns, known as a pattern ERG.
What do the electrodes do?The electrodes measure the electrical activity of the retina in response to light. The information that comes from each electrode is transmitted to a monitor where it is displayed as two types of waves, labeled the A waves and B waves.
How are eletroretinography readings made?Readings during eletroretinography are usually taken first in normal room light. The lights... Recommended Reading Related to ElectroretinographyWhat is Usher syndrome?Usher syndrome is the most common condition that affects both hearing and vision. A syndrome is a disease or disorder that has more than one feature or symptom. The major symptoms of Usher syndrome are hearing loss and an eye disorder called retinitis pigmentosa, or RP. RP causes night-blindness and a loss of peripheral vision (side vision) through the progressive degeneration of the retina. The retina is a light-sensitive tissue at the back of the eye and is crucial for vision. As RP progresses, the field of vision narrows - a condition known as "tunnel vision" - until only central vision (the ability to see straight ahead) remains. Many people with Usher syndrome also have severe balance problems. There are three clinical types of Usher syndrome:
In the United States, types 1 and 2 are the most common types. Together, they... Other Related Electroretinography ArticlesEmergency Contact for Methuen
Nearby Methuen Hospitals *Caritas Holy Family Hospital and Medical Center Lawrence General Hospital Northeast Rehabilitation Health Network Isham Health Center Whittier Rehabilitation Hospital Haverhill Merrimack Valley Hospital Saints Medical Center Tewksbury Hospital Baldpate Hospital Hampstead Hospital HC Solomon Mental Health Center Lowell General Hospital Parkland Medical Center Southern New Hampshire Medical Center St Joseph Hospital Anna Jaques Hospital Edith Nourse Rogers Memorial Veterans Hospital Lahey Clinic Medical Center Winchester Hospital HEALTHSOUTH New England Rehabilitation Hospital Kindred Hospital Boston North Shore North Shore Medical Center Beverly Hospital Melrose Wakefield Hospital Emerson Hospital North Shore Children's Hospital Salem Hospital & the Birthplace Shaughnessy-Kaplan Rehabilitation Hospital Lawrence Memorial Hospital Elliot Hospital Exeter Hospital Nashoba Valley Medical Center McLean Hospital Whidden Memorial Hospital Catholic Medical Center Manchester VA Medical Center Somerville Hospital Lawrence F Quigley Memorial Hospital Mount Auburn Hospital Cambridge Hospital Youville Hospital and Rehabilitation Center Spaulding Rehabilitation Hospital M I T Medical Massachusetts General Hospital Shriners Hospitals for Children Boston Burn Hospital Massachusetts Eye & Ear Infirmary Caritas St Elizabeth's Medical Center Franciscan Hospital for Children Arbour HRI Hospital Kindred Hospital Boston Addison Gilbert Hospital Tufts New England Medical Center Beth Israel Deaconess Medical Center Children's Hospital Boston Dana Farber Cancer Institute Brigham & Women's Hospital Newton Wellesley Hospital Boston Medical Center New England Baptist Hospital VA Boston Healthcare System Jamaica Plain Campus Arbour Hospital Radius Specialty Hospital Boston Faulkner Hospital Bournewood Hospital Hebrew Rehabilitation Center for the Aged Lemuel Shattuck Hospital Massachusetts Mental Health Center Portsmouth Regional Hospital Beth Israel Deaconess Hospital Needham VA Boston Healthcare System West Roxbury Campus Caritas Carney Hospital Kindred Specialty Hospital Natick MetroWest Medical Center Leonard Morse Hospital HealthAlliance Hospital Leominster Campus UMass Memorial Marlborough Hospital Featured Articles*Provider Directory Terms of Use: The WebMD 'Provider Directory' is provided by WebMD for use by the general public as a quick reference of information about Providers. The Provider Directory is not intended as a tool for verifying the credentials, qualifications, or abilities of any Provider contained therein. Inclusion in the Provider Directory does not imply recommendation or endorsement nor does omission in the Provider Directory imply WebMD disapproval. |
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Usher Syndrome
- There are three types of Usher (Usher's) syndrome, the most common condition that affects both vision and hearing. The major symptoms of Usher syndrome include retinitis pigmentosa (night-blindness and a loss of peripheral vision), and hearing loss. Usher syndrome is a genetic condition. There is no cure for Usher syndrome.
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