What clinical significance does an electroretinogram have?

What clinical significance does an electroretinogram have?

• A. Detects decreases in light-induced currents
• B. Measures intraocular pressure
• C. Tests color vision
• D. Measures pupil dilation

Answer: (A)

An electroretinogram provides an objective readout of retinal function by recording the retina’s electrical response to light. When light hits the retina, photoreceptors generate currents and pass signals through the retinal circuitry; the ERG captures this summed electrical activity, with the a-wave reflecting photoreceptor activity and the b-wave reflecting downstream retinal signaling. If the light-evoked responses are reduced in amplitude, it indicates diminished light-induced currents due to photoreceptor or inner retinal dysfunction. This makes ERG clinically significant because it can detect retinal problems even when vision seems relatively preserved and helps diagnose and monitor retinal diseases. The other tests—measuring intraocular pressure, assessing color vision, or evaluating pupil dilation—do not measure retinal electrical function, so they’re not what the ERG provides.

An electroretinogram provides an objective readout of retinal function by recording the retina’s electrical response to light. When light hits the retina, photoreceptors generate currents and pass signals through the retinal circuitry; the ERG captures this summed electrical activity, with the a-wave reflecting photoreceptor activity and the b-wave reflecting downstream retinal signaling. If the light-evoked responses are reduced in amplitude, it indicates diminished light-induced currents due to photoreceptor or inner retinal dysfunction. This makes ERG clinically significant because it can detect retinal problems even when vision seems relatively preserved and helps diagnose and monitor retinal diseases. The other tests—measuring intraocular pressure, assessing color vision, or evaluating pupil dilation—do not measure retinal electrical function, so they’re not what the ERG provides.