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Intensity functions of the early receptor potential and of the melanin fast photovoltage in the human eye

par Debecker, Julien ;Zanen, André
Référence Vision research, 15, 1, page (101-106)
Publication Publié, 1975

Article révisé par les pairs

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Résumé :

The early potential of the human eye is studied for a wide range of flash intensities, inducing early potentials from 0.3 to 1700 μV in amplitude. The ERP in response to white flashes begins with a cornea positive component (R1) followed by a larger negative wave (R2). On repetitive stimulation the ERP amplitude is progressively reduced. From the decrement of R2 to the 3 first flashes it can be estimated that the destruction of 10% of the visual pigment of the dark adapted eye produces an ERP of about 65 μV. The relation between the flash intensity and the amplitude of the early potential is linear from 0.3 (measured by averaging) to 140 μV. For higher values its amplitude is progressively saturated. An FPV of more than 100 μV amplitude leaves after bleaching an appreciable residual potential, which can be considered as a melanin FPV.