A retinal sensitivity abnormality has been hypothesized in seasonal affective disorder (SAD). To explore this hypothesis, the electroretinogram (ERG) was used to assess retinal sensitivity at the level of the rod photoreceptor system. We examined 27 depressed patients who met DSM-III-R criteria for major depression, recurrent, with a seasonal (winter) pattern and 23 normal control subjects who ...

We compared two electroretinography (ERG) electrodes in dogs using ERG standards of the International Society for Clinical Electrophysiology of Vision (ISCEV). Ten healthy Yorkshire terrier dogs (mean age, 2.80 ± 1.42 years; 6 females) weighing 5.20 ± 1.56 kg were evaluated using an ERG system for veterinary use. Dark- and light-adapted ERG responses were recorded using an ERG-Jet electrode and...

The authors used flash electroretinography to demonstrate dysfunction of the photopic and scotopic retina in patients with dementia with Lewy bodies and visual hallucinations (VHs) compared with patients with Parkinson disease, patients without VHs, and controls. The retinal dysfunction may be related to slight alteration of the photoreceptors and numerous pale inclusions in the outer plexiform...

The electroretinogram (ERG) evoked in the lobster by a short flash of light consists of a highly damped, slow oscillation of potential, triggered apparently by a single excitatory process. Near the threshold, only one wave may be evident; but as the intensity of stimulus rises, a prior wave appears, and grows so much more rapidly as to become dominant. Simultaneously third and later waves appea...

A. lthough it has long been known that retinal action currents are present, the electroretinogram (ERG) has not become the subject of detailed investigation in the human until recent years. Before Riggs demonstrated that the response might be easily recorded from an electrode supported by a contact lens, no satisfactory method for continuous recording from the human was available. This techniqu...

The human electroretinogram (ERG), evoked with intense illumination, presents a sequence of rhythmic wavelets superimposed on the rising phase of the b-wave.' Similar rhythmic on wavelets are found in many ver­ tebrates and are labeled the "oscillatory po­ tentials." Studies of the nature of these oscillatory potentials" demonstrated their clinical importance." Other studies demon­ strated that...