What's more, these chicken cones are distributed evenly throughout the retina, enhancing the birds' ability to see colors all around their visual field.

此外，这种鸡的锥体均匀的分布在整个视网膜内，加强了他们整个视觉系统辨别颜色的功能。

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At the early stage of FFA, all or a part of the optic disc had postponed or absent fluorescence filling with the corresponding visual field defects.

眼底荧光素血管造影早期视盘全部或部分荧光充盈延缓或缺损，伴有相应的视野缺损。

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The defect of visual field was detected in all patients, including completely homonymous hemianopsia (12 cases, 67%) and partly homonymous hemianopsia (5 cases, 28%).

所有患者均有视野改变，包括完全性同向偏盲12例（67%）和部分性同向偏盲5例（28%）。

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Others have put forward different ideas for how pigeons find their way, suggesting that the birds use smell, visual clues or the Earth's magnetic field, or even a combination of all of these.

BBC: Homing pigeon 'Bermuda Triangle' explained