He had always been curious about the thing his father wore, but because he was afraid of the old man, he never dared to ask. Now, after Li Muyun's explanation, he finally knew what the thing was called.

"Yes, the one that Your Majesty wears is glasses, but that is just a type of glasses, called sunglasses, which are used to block the sunlight. There are also reading glasses. After wearing them, you can let the elderly with blurred eyes see things close to each other. After wearing them, you can let the people with myopia see things from afar." Li Muyun pulled his finger to Changle and Li Zhi to popularize science, and also explained what myopia is, what presbyopia is, and the reasons for its formation.

After learning about the function of glasses, Li Zhi looked at Li Muyun with admiration: "Brother-in-law, you know so much. Master Kong from Hongwenguan doesn't know these things. When I saw that his head was about to plunge into the book, I didn't know how to wear glasses."

As a result, as soon as Li Zhi finished speaking, his sister patted him on his head: "Boy, that's your uncle!"

"Ah?!" Li Zhi, who was beaten for no reason, blinked innocently and looked at his sister beside him. However, Changle did not look at him, but instead said to Li Muyun: "You have said so much, but what exactly do those glasses make? You haven't said that yet."

A thousand heads were knocked, and Li Muyun naturally would not have the last bow. He said without thinking: "For colorless crystals, colorless crystals, flower glasses and myopia glasses, if they are sunglasses, they should use colored crystals, and the higher the light transmittance, the better."

But Changle obviously didn't believe him much. He heard this and nodded, "Then let's try one first, so as not to be fooled by you!"

"What am I lying to you for..." Li Muyun said helplessly.

Changle interrupted Li Muyun with a delicate voice: "If you didn't lie to me, let's go out to create a pair together. Anyway, you said that the thing is simple to make, and it's still early now."

Is it simple? Li Muyun smiled bitterly and shook his head. Although the inlaying process of glasses is simple, the polishing process of crystals is not simple at all. Not to mention a day, even three or five days can’t be polished.

However, looking at Changle's expectant eyes, Li Muyun could not think of any reason to refuse, so he could only nod and agree.

That's it. Changle and Li Muyun, with a scoundrel bottle of oil, sneaked out of the palace with the help of several guards.

After leaving the palace, Li Muyun began to regret it. The girl Changle didn't want to come out to make any glasses. She just took the opportunity to come out to let the air. The girl was laughing happily everywhere on the bustling streets, and the guards following her were soon covered with bags and bags.

When we found a store selling crystals, several guards were completely submerged in the bag.

In order to escape the little demon behind him, Li Muyun didn't even look at the decorations inside as soon as he entered the store, so he pulled the shopkeeper aside: "Take out the best crystal in your store, any color, and have good light transmission, and the colorless crystal is the best."

The shopkeeper also had a wink. Although Li Muyun was not dressed very well and was a little sloppy, Changle and Li Zhi behind him were glamorous and looked not ordinary ladies and young masters, and the few guards buried in piles of items showed that the nature of how many people were not short of money.
Chapter completed!