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There are two kinds of photoreceptor cells: rod cells and cone cells.  The cone cells have higher resolution, and are used for distinguishing colors and shape.  They are located around the macula, which is in the center of the retina.  Meanwhile, rod cells, which have less resolution, are located around the periphery of the retina.<br>


視細胞には錐（状）体細胞と杆（状）体細胞とがある。錐（状）体細胞の方が高度の機能をおこなっており、対象の色、形などの感覚に使われている。網膜の中心、黄斑に多い。一方、ｍ杆（状）体細胞は、全体的な明暗に反応する受容器であり、網膜の周辺部に多い。
Therefore, eyesight resolution is not constant throughout the retina.  This is because the cone cells are dense in the center of the retina and,  adjustment is made in order for the light from the object being watched to reach the macula.  Try reading this material without moving your neck or eye.  You can easily tell that the resolution within your visual field is not constant.<br>


視力は網膜全体で一様ではない。錐（状）体細胞は網膜中心部の黄斑に一番密に存在する。そのため注目したいものがあると、眼球を動かしちょうど黄斑にその対象がとどくようにする。眼球も首も動かさずにこの文章を読もうとしてみて下さい。ナルホド、視力は一様ではないと思ったデショ。
There are 3 kinds of cone cells for specific sensitivity to 3 colors: red, green and blue.  The ratio of stimulation to each cell determines the color being sensed.<br>


赤、緑、青の三原色にもっとも感受性の高い錐（状）体細胞がそれぞれあると考えられている。この三種の錐（状）体細胞が刺激される割合により色が感覚される。
{{QuizTitle}}
<GIFT>
//LEVEL:3
//RAND
The {=cone~rod} cells are rich in the center of the retina.


//LEVEL:3
//RAND
The {~cone~=rod} cells are rich in the periphery of the retina.


{{QuizTitle}}
//LEVEL:3
<GIFT>
//RAND
The cone cells are rich in the {=center~periphery} of the retina.


//LEVEL:3
//RAND
The rod cells are rich in the {~center~=periphery} of the retina.


//LEVEL:2
//LEVEL:2
//RAND
//RAND
錐(状)体細胞は、 {~明暗.=色、形} を判別する働きを有する。
The resolution of the cone cells is {~low~=high}.


//LEVEL:2
//LEVEL:2
//RAND
//RAND
杆(状)体細胞は、 {=明暗.~色、形} を判別する働きを有する。
The resolution of the rod cells is {=low~high}.


//LEVEL:3
//RAND
The eyesight resolution is homogeneous throughout the retina. {~true~=false}
 
//LEVEL:3
//RAND
There are cone cells which are specifically sensitive to red, green and yellow. {~true~=false}
</GIFT>
</GIFT>

2014年11月18日 (火) 21:47時点における最新版

There are two kinds of photoreceptor cells: rod cells and cone cells. The cone cells have higher resolution, and are used for distinguishing colors and shape. They are located around the macula, which is in the center of the retina. Meanwhile, rod cells, which have less resolution, are located around the periphery of the retina.

Therefore, eyesight resolution is not constant throughout the retina. This is because the cone cells are dense in the center of the retina and, adjustment is made in order for the light from the object being watched to reach the macula. Try reading this material without moving your neck or eye. You can easily tell that the resolution within your visual field is not constant.

There are 3 kinds of cone cells for specific sensitivity to 3 colors: red, green and blue. The ratio of stimulation to each cell determines the color being sensed.

Challenge Quiz

1.

The cone rod cells are rich in the center of the retina.

2.

The cone rod cells are rich in the periphery of the retina.

3.

The cone cells are rich in the center periphery of the retina.

4.

The rod cells are rich in the center periphery of the retina.

5.

The resolution of the cone cells is low high .

6.

The resolution of the rod cells is low high .

7.

The eyesight resolution is homogeneous throughout the retina. true false

8.

There are cone cells which are specifically sensitive to red, green and yellow. true false

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