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1.Human cone-rod dystrophy sufferers are sighted at birth, but lose first their central colour vision in early adulthood, before slowly losing their peripheral black and white vision as well.
人类遗传性锥体杆体营养不良患者出生时视觉正常，但成年早期即丧失中央性色觉，进而逐渐丧失外周性黑白视觉。收藏指正
2.Turtles are thought to have exceptional night vision due to the unusually large number of rod cells in their retinas.
大意是说乌龟有很出色的夜视能力，因为它们的视网膜含有大量柱形细胞（柱形细胞专门帮助动物在黑暗和弱光环境内辨认物体）。收藏指正
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