Constant amplitude electroretinography for the determination of retinal sensitivity in normal and abnormal subjects
| Autor: | George W. Weinstein, Robert S. Weinberg, Robert R. Hobson |
|---|---|
| Rok vydání: | 1970 |
| Předmět: |
Adult
Male medicine.medical_specialty Diagnostic methods genetic structures Adolescent Eye Diseases Light Wave form Dark Adaptation Retina chemistry.chemical_compound Ophthalmology medicine Electroretinography Methods Humans Macula Lutea Child Electrodes Aged medicine.diagnostic_test Contact lens electrode business.industry Adaptation Ocular Retinal Degeneration Retinal Chloroquine Middle Aged Amplitude chemistry Female sense organs Visual Fields business |
| Zdroj: | American journal of ophthalmology. 69(5) |
| ISSN: | 0002-9394 |
| Popis: | The goal of clinical electroretinography (ERG) should be to obtain rapidly a maxi mum amount of reliable information with minimal discomfort to the patient. Numer ous attempts have been made to accomplish this, but no one method has become generally accepted. Because at almost every clinic where electroretinography is used a proce dure has been devised that is specially modi fied for that clinic, and it is still virtually im possible to compare ERG data from different laboratories. Although it is easy to record the ERG, the origins of its components are still not fully understood. Using a contact lens electrode and capacitance coupled amplification, only two major electrical deflections constitute the ERG wave form as it is observed clinically. However, the criteria for classifying these responses as normal or abnormal vary widely. A useful diagnostic method depends upon developing such criteria quantitatively as well as qualitatively. The usefulness of a technique may be further extended by em ploying equipment and procedures that may be readily duplicated by other investigators. At low stimulus intensities the electroretinographic response is even simpler than it is at high intensities: the ERG consists only of a small corneal-positive deflection, the fawave; the corneal-negative a-wave does not appear until higher stimulus intensities are |
| Databáze: | OpenAIRE |
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