Volume 32 #2

Contents

1. Tinnitus – contemporary knowledge about its origin, electrophysiological correlates and treatment
2. Eye optics and retinal topography in the nutria (Myocastor coypus)
3. Quantitative study of Poggendorff illusion in school children with normal binocular vision and with strabismus
4. The method of canine odor visualization
5. Precopulatory mechanisms of reproductive isolation between two chromosomal forms of striped hamsters Cricetulus barabensis sensu lato (Rodentia, Cricetinae)
6. Discrimination of sound signals with rippled spectra in on- and low-frequency noise: contribution of compressive nonlinearity and confounding issues
7. The equivalent frequency-tuned filter form for discrimination of spectral pattern of sound signals: Contribution of the lateral suppression and harmonics

Eye optics, retinal topography, and sizes of retinal ganglion cells were investigated in the nutria Myocastor coypus. Eye optics provides emmetropy in air with the image scale of 9.7 mm/rad and hypermetropy underwater with the image scale of 2.3 mm/rad. Distribution of retinal ganglion cells in retinal wholemounts features a visual streak with increase cell density. In the visual streak, the maximum cell density was from 4930 to 5440 cells/mm2 for different wholemounts, mean 5200 cells/mm2. This density of ganglion cells results in the retinal resolution of 0.08° or 5’(6.3 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 5 to 17 μm, mean 10.5 μm in the high-density area and from 5 to 23 μm, mean 11.4 μm in the low-density area. The visual system of the nutria is adapted to the aerial vision and is not ambivalent.

Key words: nutria, vision, retina, retinal topography, visual acuity

DOI: 10.7868/S0235009218020026

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