Volume 31 #3

Contents

1. Development of functional impairments in the lateral geniculate nucleus of di erent hemispheres following early monocular deprivation
2. Eye optics and retinal topography in the Eurasian beaver Castor fiber L.
3. Recognition of projectively transformed planar figures. X. Methods for finding an octet of invariant points of an oval contour – the result of introducing a developed theory into the schemes of oval description
4. Mechanism of oxidative action of light on lipofuscin granules from the retinal pigment epithelium cells of the human eye: the role of superoxide radicals
5. Spatial and temporal integration in the chain of the transduction of olfactory signals
6. Adaptive image brightness stabilization for the industrial system of large moving object recognition
7. Fast binary linear clustering algorithm for small dimensional histograms

Eye optics, retinal topography, and sizes of retinal ganglion cells were investigated in the Eurasian beaver Castor ber L. Eye optics provides emmetropy in air with the image scale of 8.9 mm/rad and hypermetropy underwater with the image scale of 4.75 mm/rad. Distribution of retinal ganglion cells in retinal wholemounts features a visual streak with increase cell density. In the visual streak, cell the maximum cell density was from 1200 to 2240 cells/mm2 for di erent wholemounts, mean 1700 cells/mm2. This density of ganglion cells results in the retinal resolution of 0.15o (9’, 3.3 cycle/deg). This value can be assumed the visual acuity in air. Underwater, the visual acuity is markedly less due to the lesser image scale and defocusing. Ganglion cell sizes varied from 7 to 29 μm, mean 14.9 μm in the high-density area and 14.3 μm in the low-density area. The visual system of the beaver is adapted to the aerial vision and is not ambivalent.

Key words: beaver, vision, retina, visual acuity

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