在胎儿时期,眼睛的出现不算晚:4周左右,有了雏形,到6周,显现视神经和眼皮;至12周,规模初具,及至胎儿长到7～8个月,双眼只是见到光亮之后,引起一点反应,要使双眼能随光亮移动,还得在出生以后才行。足见用眼看东西,也并非易事。即使刚出生不久的婴儿,大约只能分辩亮和暗;对于色彩,要到1～2个月后才能有反应;而要正确说明各种颜色,还得在4～5岁之后。又如,两只眼 In the fetal period, the appearance of the eye is not too late: about 4 weeks, with the prototype, to 6 weeks, showing optic nerve and eyelid; to 12 weeks, beginning to scale, until the fetus grows to 7 to 8 months, his eyes just see After the light, a little reaction, so that both eyes can move with the light, but also after the birth Caixing. It is not easy to see things with eyes. Even infants born in the first place are only about bright and dark; for color, they can not respond until after 1 to 2 months. To correctly explain each color, they must be 4 to 5 years old. Another example, two eyes