[Effects of the light level and duration of the photoperiod on the retina of albino rats].
Female albino rats were exposed during 3 weeks to various photoperiodic sequences and levels of illumination. As long as the light span of the photoperiod did not exceed 12L-12D, the damaging effects of the light, even when intese (3,000 lx), on the retinal were relatively limited. On the other hand, the 14L-10D photoperiodic regimen that is usually used in standard rat animaleries produced marked degenerative lesions on the photoreceptors under either 1,200 or 3,000 1x. Under lighting schedules of 21L-15D or 28L-20D, the photoreceptors were heavily injured by 1,200 OR 3,000 1X. The degenerative process affected all the photoreceptive cells as well as their various components: rods, cones, nucleus and synaptic endings.
D000818:Animals; D005260:Female; D008027:Light; D008452:Maximum Allowable Concentration; D009411:Nerve Endings / Q000528:radiation effects; D010786:Photoreceptor Cells / Q000528:radiation effects; D051381:Rats; D012160:Retina / Q000528:radiation effects*; D012162:Retinal Degeneration / Q000209:etiology* / Q000473:pathology; D013569:Synapses / Q000528:radiation effects; D013997:Time Factors
Effets du niveau lumineux et de la durée de la photopériode sur la rétine du rat albinos