Shen Han was very careful.

He's not young, and he's not the kind of stunned young man who doesn't understand anything.

He waited for Meng Xiran to think alone for a while before he asked again, "Brother Xiran, where do you live now?" If you have any difficulties, be sure to tell me. As long as I can help, I will definitely help you. ”

Meng Xiran was suddenly a little embarrassed.

He had just come to the capital, and he didn't have much money in his hand, so he could only find an empty house in a village outside the city where no one lived.

This empty house is not free, and the village has to pay a sum of money, but fortunately, there is not much money.

It's just that the house is too simple, and the roof is very dilapidated, and if it rains, I'm afraid it will leak down.

He is so depressed, where is he embarrassed to tell Shen Han?

Shen Han saw his embarrassment, so he wisely didn't ask any more, but asked Shen Qian to take some newspapers and magazines over and give them to Meng Xiran.

"Brother Xiran, please see, this is a newspaper and magazine sold by Zhuangyuan Library, and many articles on it are from submissions, you can take a look, refer to it, and write articles to submit."

Meng Xiran was grateful.

He eagerly took the newspapers and magazines, and then read them.

Because of his bad eyes, he almost held the newspaper up in front of him, and Shen Han was very uncomfortable.

He thought about it for a while, and simply asked Shen Qian to invite Doctor Sun over.

In fact, he wanted Shen Qian to ask Princess Qin if there was a way, but with his current status, it was too inappropriate to rashly let Shen Qian go to King Qin's mansion.

It's better to ask Dr. Sun.

As far as he knew, Doctor Sun had lived in the Marquis Mansion of Wuyang for a few days, and since then, he has admired Princess Qin's medical skills.

If he saw Meng Xiran, but he couldn't treat it, maybe he would go to the Qin Palace's mansion for advice.

In that case, Meng Xiran might be saved.

Doctor Sun came quite quickly.

He was very curious about Shen Han.

Shen Han was broken by someone at the beginning, obviously he was not saved, who knew that Shen Han would be able to return to normal!

Since then, Doctor Sun has been very interested in Shen Han.

He even took the initiative to come to the door to see Shen Han's legs.

It's a pity that he was rejected by Shen Han mercilessly.

This time Shen Han asked him, of course he had to hurry over to see what was going on!

After Doctor Sun arrived, Shen Han introduced him to Meng Xiran and begged him to help Meng Xiran look at his eyes.

On the way here, Doctor Sun was still thinking that after seeing Shen Han, he had to take the opportunity to look at his legs.

However, when he saw Meng Xi, he forgot about it.

He carefully examined Meng Xiran's eyes, asked a lot of questions, and finally frowned and said, "Your eyes are a little troublesome, so let's go back and think about whether there is any way." ”

Meng Xiran himself didn't dare to hold out much hope, but when he heard Doctor Sun say this, his heart still sank.

Although disappointed, he still saluted: "Then there is the miracle doctor Laosun." ”

Doctor Sun nodded casually and quickly left.

He planned to go to the Qin Palace.

Meng Xiran's eyes, he really didn't have any good way. However, he remembered that the old lady of the Marquis of Wuyang Mansion had a pair of glasses, and it was said that after wearing them, he could see them clearly.

It's amazing.

The glasses were given by Princess Qin.

Therefore, Princess Qin may be able to have a way. 113

Doctor Sun called a rickshaw and quickly rushed to the Qin Palace.

In King Qin's mansion, Su Jinli was bored. When she heard that Doctor Sun asked to see her, she was stunned for a moment.

"Divine Doctor Sun? How did he get here? "Did you hear something?

Su Jinli felt strange, but she was just bored, so she asked Doctor Sun to come in.

After Doctor Sun came in, he first bowed in a proper manner, and then couldn't wait to say what he meant: "Sun Mou came this time, in fact, he wanted to ask the princess about something. ”

Su Jinli was curious: "What do you want to ask?" ”

Doctor Sun immediately said, "Sun just saw a patient, that person has a bad eye since he was a child, he can't see things in the distance, and he hurt his eyes not long ago, and the situation is even more serious, and he has to take the book to the front to see clearly."

He asked Sun to help him treat his eyes, but unfortunately Sun had studied medicine for many years, but he was helpless against this disease. So I want to ask the princess, is there a cure? ”

Only then did Su Jinli understand what Doctor Sun was here to do.

The symptoms he spoke of sounded like he was born with myopia.

But whether it was or not, she couldn't be sure if she didn't see the patient.

The problem is that with her current status as a princess, it is impossible to be an ordinary doctor and treat people.

Su Jinli thought about it.

At this time, the lighting tools were mainly oil lamps and candles, but candles were much more expensive than lamp oil, so those who were poorer used oil lamps and were reluctant to use candles.

Not to mention the butter candles.

Whether it is an oil lamp or a candle, the light is much worse than that of the starting lamp.

When the light is dim, it is easy to hurt the eyes.

Therefore, many embroidery girls are young, and their eyes are broken.

There are so many people in the world, she will definitely not be able to cure them.

But what if you launch glasses?

Looking at the entire Tianlong Dynasty, there must be many people with myopia and presbyopia.

If two kinds of glasses are introduced, it will not only benefit these people, but also make a lot of money.

Thinking of this, Su Jinli's heart moved.

She glanced at Doctor Sun, and saw that Doctor Sun was still waiting for her reply, so she said, "The patient that Doctor Sun just said is a little troublesome, but in his case, he may be able to see things with the help of tools." ”

Doctor Sun's heart moved, and he couldn't help asking, "What the princess said, but the kind of glasses that the old lady wore?" ”

Su Jinli smiled: "It's glasses, but it's different from the one worn by the old lady." You go back first, I'll see if I can make it. ”

Doctor Sun didn't want to go back, but he also knew that Su Jinli's current identity was different from before, so after hesitating, he didn't dare to stay for a long time and went back obediently.

After he left, Su Jinli began to ponder.

The power of a lens is the power multiplied by one hundred, and the power is the reciprocal of the focal length.

In other words, as long as the power is determined, the focal length of the lens can be determined based on the power.

However, it is not easy to make the right lenses.

Because the refractive index of different materials is different, and the refractive index is different, which will lead to different thickness of the lens.

Modern equipment is more advanced, the material is also stable, and the refractive index can be controlled.

In ancient times, there was no such condition.

Different batches of glass, I am afraid that there will be slight differences in the refractive index.

If you want to make lenses, you have to experiment continuously to make a rough lens mold.

Then strictly control the proportion of raw materials when firing glass to ensure that the refractive index error is not large.

After Su Jinli finished pondering, he changed into men's clothes and went to Liulifang in person and began to toss the lenses.