Electroretinography of Experimental Animals

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Abstract
The electrodes, condenser-coupled amplifier, cathode ray tube and photographic recorder used in this exptl. work on pigeons, rabbits and guinea pigs are descr. in considerable detail. A moveable stimulus lamp was incorporated so that the position of the stimulus could be altered to suit that of the animal. Nembutal anesthesia was used, supplemented in pigeons by retrobulbar procaine to reduce the pronounced blink reflex. The pigeon''s retina (predominantly cones) is more sensitive to the longer wave lengths; the rabbit''s retina (predominantly rods) is more sensitive to the shorter wave lengths. Dark adaptation was measured by the minimum stimulus required to produce a barely perceptible response. The rabbit''s eye is fully dark adapted within 5 min. In vit. A deficiency the sensitivity of the retina decreases relative to the deficiency, but it recovers when vit. A therapy is resumed.
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