Li Chengqian pulled it off, Kong Wen reluctantly dragged it out of the room, turned a few turns and got down from the upper floor, and then rushed to the carriage when he came.

"Gao Ming, what are you going to do? Run slower." While running, Li Chengqian staggered several times and almost fell down. Finally, Kong Wen had to speak out to stop him, and at the same time slowed down and slowed down his speed.

"Follow me, you will know when you get to the place." When he arrived at the side of the carriage, Li Chengqian opened the door and asked Kong Wen to get on the carriage, while urging him.

Kong Wen was confused by him. At the same time, when he thought of the betrothal gift that Li Chengqian mentioned in the room just now, he couldn't help but feel even more panicked, not knowing whether he should get in the car.

"Little ancestor, you're here to hurry up. It's too late for a while." Li Chengqian urged again. There are still several places to run away. If you continue to procrastinate, it's probably too late for the time.

In desperation, Kong Wen half-pushed and half-willed into the carriage, and then the car drove out of Chang'an City at the command of Li Chengqian and headed towards the glass workshop outside the city.

"Gao Ming, what are you doing in the glass workshop?" After knowing the destination, Kong Wen asked even more confused and curiously.

After so long, her mood had calmed down and she also threw the so-called betrothal gift aside. Li Chengqian was too unreliable, so there was no need to be serious about his words.

"Did your grandfather always feel that he is vaguely unclear when reading? When reading books, he always likes to squint his eyes and hold the books far away, right?" Li Chengqian gasped in the carriage and asked at Kong Wen beside him.

"Yes, how do you know?" Kong Wen nodded.

"Of course I know that almost all the old guys in the court are like that." Li Chengqian said pretentiously until Kong Wen pouted, and then smiled faintly: "This is called presbyopia. Most people will basically do this when they are old."

"Is it sick?" Kong Wen was a little nervous after hearing Li Chengqian's explanation.

"It's not a disease, it's just that when people get older, it's just like when they get older, it's like their hair will turn white." Li Chengqian comforted Kong Wen.

"Then..." Li Chengqian suddenly mentioned the question of his eyes. Kong Wen felt that this time he left the city, it should be related to the eyes of the old man at home, but she couldn't figure out what it was. She wanted to ask but didn't know where to ask.

"Remember what I told you about muscle regulation some time ago?" Looking at Kong Wen's curious eyes, Li Chengqian said: "There are such muscles in human eyes. Usually, we adjust our vision through the extension of these muscles, so that we can easily see things in the distance or near."

"But when people get older, the muscles in their eyes will gradually lose some of their regulation functions, and then they will become blurred when they see things nearby. This is the case with presbyopia."

Li Chengqian didn't know how to tell Kong Wen about the principle of imaging, so he could only briefly outline what presbyopia is through eye muscle adjustment.

"Gao Ming, you can cure presbyopia, right?" After listening to the explanation about presbyopia, Kong Wen's eyes lit up.

Li Chengqian is not a targetless person. He can spend so much effort to explain the cause of presbyopia, so this time itinerary must be related to this.

"Yes, it's about solving this problem." Li Chengqian nodded confidently: "Human muscles cannot be adjusted automatically, so we can use external forces to adjust it."

"Your magnifying glass is the most critical point, so we are going to the glass workshop now, get more magnifying glasses, and use them as a test to see if it can achieve the purpose of correcting etiquette."

Along the way, Li Chengqian and Kong Wen talked about some simple imaging principles, and felt that they had already arrived at the glass workshop without much time.

"Adang, how many newly processed convex lenses are there?" Li Chengqian asked when he jumped out of the carriage and looked at the bearded man who had come out of the workshop.

"Dear Master, there are 136 yuan in total." A Dang was taught a lesson by Li Chengqian several times. Now he is no longer talking like before, and his master and servant are much simpler.

"Take it all for me, I'm useful."

"Everything is all brought? Master, then, will the telescope not be produced?" A hint of surprise flashed across Adam's face.

These 36 convex lenses took several months to create. Whether in terms of light transmission or bubble content, they are all "perfect".

"If you produce that thing slowly in the future, and now you can bring all those lenses, this palace will be of great use." The telescope, the Tang Dynasty, does not need too much, and it doesn't take too much to slow down.

"Yes!" As the biggest boss of the glass workshop, Li Chengqian's words were executed unconditionally, and soon a large number of convex lenses were put into boxes and brought over.

"Adang!" Before leaving, Li Chengqian poked his head out of the carriage and said to the bearded man: "Get another batch of convex lenses, this time it will be bigger, with a diameter of ten centimeters, twice to five times, each of which costs five yuan."

"Yes, the villain understands!" Although Adam didn't know what this 'great' master wanted to do, he was smart and had already learned to ask less, say less, and do more, so although he was very curious, he still agreed as he said.

"Go and be the supervisor!" After leaving the glass workshop, he ordered the guards who were driving and compared the convex lenses one by one.

It is true that reading glasses are convex lenses, but everyone is different in terms of dizziness, so the degree of reading glasses they need is naturally different.

Fortunately, reading glasses do not have as strict requirements on degree as myopia glasses, so as long as they can see them almost clearly.

Kong Wen didn't know about this, but she felt very curious when she saw Li Chengqian picking her around and she couldn't help but start helping under Li Chengqian's guidance.

But soon, Li Chengqian discovered that what he did now was futile, because they did not have a presbyopia, so they could not confirm that lenses were used together.

There is no other way. In this case, if you want to determine what kind of lenses are suitable for presbyopia, you can only find another way and find an old man to try it yourself.

So, under the instigation of Li Chengqian, Kong Wen sacrificed her grandfather and brought Li Chengqian back to the Kong family mansion in Chang'an.

"The old minister has seen His Highness the Crown Prince!"

"Disciple Li Chengqian has met Master Kong!"

When we arrived at the Kong family, we naturally had to greet each other. It was time for both parties to sit down.

After sitting down, Old Man Kong looked at his granddaughter and Li Chengqian. He sighed in his heart, pondered for a moment and asked, "Your Highness, I wonder what is important to come today?"
Chapter completed!