Datang: The prince of salted fish was overheard by Li Er

"Don't worry about the optometry. What is that battlefield weapon that King Yan mentioned?"

Seeing Li Jing's impatient look, Li You chuckled and said, "Since Duke Wei is so impatient, follow me."

Then Li You took Li Jing up to a small three-story building next to the courtyard.

When he came to the highest point of the courtyard, Li You pointed to a signboard not far outside and asked, "Duke Wei might see it?"

Li Jing took a closer look, but smiled and said: "Although my eyes can't see things that are nearby clearly, it doesn't affect things that are far away."

"The sign over there is Xinyuan Xingmi Store!"

Li You smiled and nodded.

Presbyopia is due to the decrease in elasticity of the lens inside the eye caused by aging. If there is no cataract-like pathological changes, it will not be affected when seeing far away.

So it was not surprising that Li Jing could see the signboard about [-] paces away.

But Li You asked him to come up, not just to look at the signboard.

He went on to ask: "Then, can Duke Wei see clearly what is on the shelves at the entrance of Xinyuanxing Rice Store?"

Hearing this question, Li Jing couldn't help frowning.

Although he could barely see three different things on the shelves, he couldn't tell what they were.

"The red ones should be jujubes, and the yellow ones should be corn, but I can't see the other one clearly."

Such an answer made Li You nod secretly. Although he couldn't see clearly, Li Jing's judgment based on the color was exactly the same as what Li You's enhanced eyesight could see.

But at the same time, Li You was finally relieved a lot.

If Li Jing answered correctly again, he would have to choose something farther and smaller.

Although this is also to highlight the effect of looking at the glasses later, it is a bit embarrassing for the veteran.

After smiling, Li You took out a wooden tube from his arms and handed it to Li Jing, "Duke Wei, try looking through this telescope."

With the experience just now, Li Jing is not so unfamiliar with viewing things through the lens. He took over the telescope and began to look.

"This!"

"What kind of magic is this!"

"Could it be the legendary clairvoyance!"

Li Jing exclaimed three times in a row.

In his opinion, exclaiming is not enough to represent his mood at the moment, he just feels that the miracle is right in front of his eyes.

"Mr. Wei, don't be so surprised. The thing in your hand is called a telescope, which is used to see things in the distance."

"It's the same as the magnifying glass you used just now, it's all made in a workshop, not some fairy method."

Hearing this, Li Jing finally calmed down.

However, he was still reluctant to put down the binoculars, and instead looked further afield.

"Not only the rice line, but also the flag on the imperial city can be seen clearly!"

"Look, Cheng Yaojin leads a team to patrol the imperial city today!"

Hearing this, Li You also looked in the direction of the imperial city.

Even with his system-strengthened eyesight, he could only vaguely see a group of figures walking slowly.

[This is the power of technology. 】

[Developing the potential of the human body is important, but the reason why humans are different from animals is because of the use of tools. 】

[If a worker wants to do a good job, he must first sharpen his tools. This is the truth. 】

Li Jing turned around like a child, then reluctantly put down the binoculars in his hand, and then asked with disbelief: "King Yan, is this binoculars the battlefield weapon you said you wanted to give me?"

Li You nodded and said: "It is this thing. After the Shence Mansion researches this thing, my king will definitely use it on the battlefield for now."

Li Jing nodded and agreed: "Of course, with this sharp weapon, the two armies only need to find a higher place to set up an observation post to see the situation on the other side clearly."

"Even if you can't find a suitable observation position, using it on the sentry tower can detect the enemy's movements much in advance."

"I really admire the skillful craftsmen of Shence Mansion, who can create such a sharp weapon that can give the enemy the opportunity!"

"I don't know how many telescopes King Yan has, and how much are they worth?"

In Li Jing's opinion, this thing must be of great value, and the quantity is extremely rare.

However, what Li Jing didn't expect was that Li You tilted his head and thought for a while and said, "This thing is only one piece in seven or eight pieces. If we set up a special workshop to make hundreds of pieces a day, it shouldn't be a big problem."

"What! This thing can be mass-produced!"

For a moment Li Jing was so startled that he couldn't close his mouth from ear to ear.

"Of course, since the Shence Mansion has already researched it, it can naturally be mass-produced."

"But now, there is no dedicated workshop, so we can only make a small amount for the generals on the front line."

"But Duke Wei, don't worry."

"When the first batch of buildings in the two workshops of my king are completed, a new workshop can almost be established."

The matter of Li You's two workshops was once a turmoil in Chang'an, and of course Li Jing knew about it.

Li Jing felt extremely excited when he thought that all the generals and scouts of the Tang Dynasty could be equipped with such a clairvoyance in the future.

"Li Jing, on behalf of hundreds of thousands of soldiers, thanked you for the contribution King Yan made to the Tang army."

"Although King Yan is young and doesn't go into battle to fight the enemy, he is better than [-] soldiers when he strategizes in Chang'an!"

Speaking of this, Li Jing couldn't help looking forward to Li You.

However, Li You, who felt the expectation, was startled, and then quickly waved his hands and said, "Duke Wei, don't say that, this king just wants to be a prince of peace."

"The study of these things is also the credit of the Shence Mansion. It is only for the sake of being able to live in Chang'an now and in the fief in the future."

Li Jing did not refute Li You's remarks, on the contrary, he appreciated Li You's outspokenness and calmness even more.

He has seen a lot of Li Shimin's princes. He used to admire Li Ke, the king of Shu with a bit of iron and blood, but now he feels that the seemingly lazy Li You in front of him is even more unfathomable.

"Hey, I hope the things that happened back then don't happen again between their brothers."

Li Jing sighed silently in his heart.

Then, Li Jing carefully put away the binoculars and went downstairs to have an optometry.

Three days later, Li Jing received reading glasses specially customized for him.

After putting on the glasses, he understood what Li You said about the convenience of glasses.

Although it felt strange to have a little more on his head, being able to see things close up again made him seem to be rejuvenated again.

In order to facilitate the handling of military reports from various places, Li Jing wore glasses and went to court.

From Li Jing's point of view, this thing is just for reading newspapers, and it would be a waste not to take it to court.

But he didn't expect that this time when he went up with glasses, he caused another big disturbance!