The reason why Liu Xian said it was very unreasonable, but it was also because of this, which made a trace of doubt rise in Cangman's heart.

For a normal person, there is no reason not to use a simpler method, but to use this somewhat silly method.

Cang Mang didn't think that Liu Busy was a fool, so there was a reason for all this.

Thinking about Liu Busy's performance when he was refining the pill, and thinking of the mistake that Liu Busy made when distinguishing the elixir, a guess immediately flashed in his mind.

The more he thought about it, the more he felt that it was possible: "You can rest here for a while." ”

Cang Mang said and left the room, and after a while, he came in with a few cards that had just been made.

The cards were placed on the table one by one.

Red, orange, yellow, green, cyan, blue, purple, and other cards are placed in front of you.

"Tell me what's the difference between these cards?"

Liu hurriedly divided the seven cards into two categories.

Red, orange, yellow, and green were grouped into one category.

Blue, blue, and purple were divided into categories by him.

Then Liu Xian first picked up the four cards of red, orange, yellow, and green and began to study, first comparing the size, and then carefully observing the patterns there.

Seeing Liu Xian's move, Cang Mang had already determined, and shook his head helplessly.

Liu Xian noticed Cang Mang and shook his head, thinking that Cang Mang was a little impatient, but the four cards in his hand seemed so similar to him, and he didn't find much difference between them.

Gritting his teeth, he was about to say something casually.

Cang Mang was the first to speak: "Needless to say, I already know the problem." ”

Liu was busy looking at the vastness for some reason.

Cang Mang took seven cards, red, orange, yellow, and green in his left hand, and blue, blue, and purple in his right hand.

"Is that all you see the difference?"

Liu Xian kept tilting his head, looking at the cards from different angles, and said uncertainly: "It seems that there is a little difference in the shade of color." ”

Cang Mang put the card aside and affirmed, "That's right." ”

In Liu Xian's expectant gaze, Cang Mang threw out his answer: "You are red-green blind." ”

Liu hurriedly asked, "Color blindness, what is color blindness?"

Cang Mang began to recall that although this was a world of cultivation, it seemed that there was really no concept of color blindness.

"Red-green blindness is a disease, and in your eyes, these seven pieces of paper have only two colors, yellow and blue. But in a normal person's eye, these seven pieces of paper are seven different colors. ”

Only then did Liu Xian know that what he saw in his eyes was different from what he saw in the eyes of others.

In the past, whenever he talked about color, he felt very difficult, but because he was like this since he was a child, he did not have the concept of color blindness.

So I didn't know how I was different from others, and I thought I just hadn't understood the subtleties between colors and colors.

It was precisely because Liu was busy with his defects in color discrimination that he was unable to observe the color changes of the spirit grass in the Dan furnace, and it was difficult to control the heat, so that the success rate of alchemy was so low.

Cang Mang also understood why Liu Xian found out so many details on the spirit grass, in fact, it was all to make up for his vision defects.

Although Liu Xian knew about his illness from Cangmang's mouth, because it was the first time he had heard of the condition of color blindness, he didn't know what to do with the symptoms, so he pinned his hopes on Cangmang.

He asked a little nervously, "Senior brother, how can my eyes be the same as normal people?"

To be honest, I don't know what to do.

In another part of his memory, congenital red-green color blindness was incurable.

But now in this world, it is a world that can create countless miracles, a world that has aura and can use it.

Here, even severed limbs can be reborn, and it should be possible to treat a pair of eyes!

But Cang Mang also understands that Liu Busy's situation may not be solved by just having aura.

Otherwise, as a cultivator, his body doesn't know how many times he has been nourished by the aura, and if it can solve the problem, it will be solved a long time ago.

Judging from his current situation, it is estimated that he will have to rely on some external stimuli.

Cang Mang told Liu Busy the truth about his idea, and Liu Busy also knew that there would be difficulties, but he didn't even know the cause of the disease, and naturally he didn't know any way to deal with the symptoms, so he could only pin his hopes on Cang Mang.

"I'll think about it again, it's not too early, you can go back first. ”

Liu Xian's mouth squirmed a few times, as if he wanted to say something, but in the end he still didn't say it.

Cang Mang took out a porcelain bottle and threw it to Liu Xian: "This pill is called Wujue Pill, which can enhance people's five senses, you can take it and try it first, but I think this thing may not cure your eyes." ”

Although Cang Mang said this, this thing was a lifesaver for Liu Xian, even if there was only a glimmer of hope, he was full of expectations.

In the past, Liu Xian had been looking forward to a moment when he could suddenly have a flash of inspiration and let him suddenly understand the essence of alchemy.

Only today did he know why he worked so hard to study alchemy, but the result was so much worse than other Dan masters.

It turns out that it is not that the acquired effort is not enough, but that it is congenitally insufficient.

With this kind of deficiency, Mo said that he has understood the essence of alchemy, and I am afraid that he will not even be able to reach the ordinary level.

As long as his eyes can't be the same as normal people for a day, then he will have a hard time in alchemy, and I'm afraid he will have to stop there.

Liu Xian cherished the Wujue Pill that Cangmang threw to him, bowed to Cangmang very seriously, and then left Xianyaju.

After he left, Cang asked Xiao Ginseng about color blindness.

Xiao Ginseng didn't know what the concept of color blindness was, but after Cangmang's explanation, he knew that it was a congenital physical defect, so he proposed three plans for Cangmang.

The first method, as long as Liu Xian can reach the realm of adjusting the gods, he will be able to wash his muscles and cut the marrow through the opportunity of second awakening, and any congenital deficiencies can be made up at that time.

But this seems to be too far away for Liu Xian, and it is not certain whether he can have a chance in this life, after all, there are only a few people who can reach the Divine Adjustment Realm, otherwise the second watershed between cultivators will be meaningless.

The second method requires the Heavenly Pill, but the Heavenly Pill is not a simple pill, and the medicinal materials needed are extremely precious, not that it can be refined by refining.

At the very least, there are no materials needed to refine the Heaven Replenishing Pill, let alone refine it.

The third method is to find a cultivator who is good at the medical path and above the Tempering God Realm, and transplant the eyes of Liu Xian's blood relatives to Liu Xian.

But Liu Busy is an orphan, where is there an eye transplant for him? And where can he find such a strong person in the Divine Adjustment Realm to transplant Liu Busy's eyes?