题目内容：

    Did you know that most humans are able to recognize about 1 million different colors? Well, some people can’t recognize this many because of something called colorblindness. If someone is colorblind, that means they can’t see as many colors as others – or, in rare cases, can’t see any colors at all.

Thankfully, special glasses have already been made to help fix some types of colorblindness. Now, according to new research published in Optics Letters, scientists have brought this solution one step further.

Sharon Karepov and Tal Ellenbogen, engineers from Tel Aviv University in Israel, have found a way to apply this technology to contact lenses. This new method is so groundbreaking because it can be customized to fix many different kinds of visual disadvantages.

People are able to see colors because of how the eye is structured. At the back of our eyes, there are three different kinds of cone-shaped (圆锥形的) cells that absorb light waves. When light waves are absorbed, the cells send a message to the brain for the image to be processed.

If something is wrong with these cone-shaped cells, this can cause problems when the brain processes the image. One of the most common types of colorblindness is red-green colorblindness. People who have this specific type of visual disadvantage have difficulty telling apart the colors red and green.

“Problems with distinguishing red from green interrupt simple daily routines such as deciding whether a banana is ripe,” Karepov explained.

Karepov also stressed the importance of applying this finding to create special contact lenses instead of relying on color-correcting glasses.

“Glasses based on this correction concept are commercially available, however, they are significantly heavier than contact lenses.” Karepov continued. “Our contact lenses … create a customized, simple and durable way to correct these disadvantages.”

1.Why is Sharon Karepov and Tal Ellenbogen’s finding groundbreaking?

A.They found an effective method to cure colorblindness.

B.They found what causes different kinds of visual disadvantages.

C.They developed special contact lenses to fix many visual disadvantages.

D.They developed glasses to fix all visual disadvantages.

2.What is the cause of colorblindness, according to the text?

A.Only one type of cone-shaped cell exists in the eyes.

B.Cone-shaped cells cannot process images received.

C.The brain fails to absorb light waves.

D.Cone-shaped cells in the eyes don’t work properly.

3.Why are the customized contact lenses better than special glasses, according to Karepov?

A.They are easier to make. B.They are cheaper.

C.They are simpler and more durable. D.They can help correct colorblindness.

4.Which of the following can be the best title?

A.Special Contact Lenses—Seeing the World’s Full Beauty

B.Glasses to Correct Colorblindness

C.Colorblindness Preventing People from Seeing Colors

D.Colorblindness—Something is Wrong with Cone-shaped Cells