CPT® Code 92275

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Electroretinography (ERG) is a specialized diagnostic procedure used to assess the functional status of the retina, particularly in relation to various retinal conditions. This test is crucial for identifying and evaluating disorders that may affect vision by measuring the electrical responses of retinal cells to light stimuli. During the procedure, mydriatic drops are administered to dilate the pupil, allowing for better light penetration and more accurate readings. The patient undergoes a dark adaptation period lasting approximately 30 minutes, which is essential for optimizing the retina's sensitivity to light. Following this adaptation, electrodes are strategically placed on the surface of the eye, utilizing dim red illumination to minimize interference with the test. Various types of electrodes can be employed, including contact lens electrodes that rest directly on the cornea or gold Mylar tape electrodes positioned between the lower eyelid and the sclera or cornea. These electrodes are connected to a recording device that captures the electrical activity of the retina. To ensure stability during the test, the patient's head is supported using head and chin rests. The retina is then stimulated by flashes of light emitted from a bright light source, such as light-emitting diodes (LEDs) or a strobe lamp. Alternatively, a full-field dome equipped with its own light source may be utilized. The light flashes elicit an electrical response from the retina, which is recorded by the electrodes and displayed digitally as a waveform. The test typically involves recording responses first in a dark environment and then with background lighting. The results are analyzed by evaluating two key components: the a-wave and b-wave. The a-wave indicates the amplitude from the baseline to the lowest point (trough) and is indicative of the health of the photoreceptors located in the outer retina. Conversely, the b-wave measures the amplitude from the trough of the a-wave to its peak, reflecting the health of the inner layers of the retina. A comprehensive written interpretation of the findings is subsequently provided, summarizing the results of the electroretinography test.