Volume 31 #1

Contents

1. Sensory properties of reward pattern affect food preferences in rats
2. Probable role of p38 MAP-kinase in reception of infrared irradiation
3. Investigation of Src-kinase inhibitor PP2 effects on modulation of slow sodium channels by ouabain
4. Perimetric assessment of a blind zone margin at the extreme periphery of human temporal retina
5. LogMAR for visual acuity is worse than horsepower for electric lamp
6. Bright light induced freezing behavior in American cockroach, Periplaneta americana
7. Analysis of human eye movements in the management of self-propelled chassis with video eye-tracking interface system
8. Mechanisms of transduction of olfactory signals: the possible role of the contractive apparatus of the olfactory ciliae
9. Architecture of a system for computer vision-based vehicle detection and classification under natural conditions
10. Localization of a stereo camera equipped robot using poles with known location as landmarks

In order to assess a blind zone margin at the extreme periphery of the temporal half of human retina, comparative evaluation of the temporal and nasal margins of the visual eld was performed in 16 subjects for several directions of gaze. The margins were estimated by means of a standard perimeter. The test stimulus was a LED producing a light spot ickering with frequency 2 Hz. The measurements were carried out for each eye in conditions of gaze xation on the center of perimeter arc (0°) and on the points shifted temporally by 15–30° to eliminate the occlusion of the nasal visual eld periphery by the nose usually taking place in standard clinical measurements with 0° direction of gaze. In the standard measurement conditions, the temporal and nasal margins varied among our subjects in the ranges 78–109° and 57–70° respectively. In about half of the subjects, no extension of the nasal eld had been found when the xation point was shifted temporally, indicating that the size of the blind zone corresponded to the di erence of the temporal and nasal clinical visual elds. However, in 6 subjects, a reliable increase of the nasal visual eld by 5–15° has been revealed manifesting that not the whole part of the temporal retina shielded by nose is blind. The data obtained indicate the plausibility of an old hypothesis (Brændstrup, 1948) implying that, at least partially, blindness of the extreme temporal retina periphery could be considered as a deprivation amblyopia developed due to the occlusion.

Key words: nasal visual eld, peripheral blind retina, individual variability, amblyopia

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