Night blindness is a condition that manifests itself in the form of poor or complete vision in the dark or at night.

Night blindness, commonly known as "blindfolding", is a condition that affects people at night or in dimly lit environments.

For a long time in China's history, night blindness was almost a common problem, and the key to this problem was actually the relative low productivity and low living standards of the people.

Not only in China, but in the underdeveloped era, in the whole world, night blindness is a common problem.

This problem is not only reflected in life, but also in the aspect of war, in the war before thermal weapons, night raids have almost become a very common tactic, in the hands of famous generals, repeatedly succeeded, in some key wars, because of night raids and change, strength and weakness.

The reason why the night attack is so unguardable, the negligence of precautions, and the fact that the other party does not want to attack is only one aspect, and night blindness is also an important factor.

Even in the fixed camp, with only a simple fire, some people come in, except for a few people, most of them are like blind people, and a few people are dying, and if they are not trained, maybe the camp will be blown up.

Professional soldiers, this is not very often, even if it is the current Northern Song Dynasty, the elite forbidden army, can be regarded as professional soldiers, not every one of them is, the number of professional soldiers, and money has a huge relationship, any powerful army, is a gold-swallowing beast, even if it is as rich as the Northern Song Dynasty, in addition to extraordinary preparation, it will not expand casually.

Night raid is an uncommon tactic, he has a huge gambling and uncertainty, once successful, it must be a big book, it is a classic to turn defeat into victory, or to win more with less, but once it fails, it will be doomed.

Night blindness is a double-edged sword, others can't see it, you can see it, even if you pick a batch, there is no night blindness, under the premise that the visibility at night is not high, the danger is particularly great, unless it is an extreme premise, otherwise, no one will choose so.

Such a large-scale, universal disease, but I don't know what the reason, even Chinese medicine is very strange, this is different from the ordinary disease of wealth, this is specifically looking for the poor, the average rich and noble, rarely get this disease, mostly some poor people, the poorer, the higher the chance of getting the disease.

Because there are many poor people, they have no money for treatment, and because of night blindness, he has little impact on the whole, except that he can't see at night, there is nothing else.

It's not that it's invisible, it's just that when the light is low, you can't see clearly, which has little impact on ordinary people.

The sun rises, the sun sets, the long dark night, for most farmers, that is, lying in bed to rest, or going to bed early, really very few come out at night, so many people do not regard this as a disease.

The whole world, much the same, in the industrial society, after the beginning of the industrial revolution, longer and longer overtime and endless production, so that doctors began to study the causes of night blindness.

After countless setbacks and the continuous efforts of some genius doctors, the cause of it was finally found.

According to scientific explanations, the final cause is night blindness, which is a vitamin A deficiency.

Dietary deficiency of vitamin A, or the cause of certain diseases, affects the synthesis of vitamin A, which is one of the main causes of night blindness.

After vitamin A is absorbed in the human body, it will form a rhodopsin, which is a combination of the eye and vitamin A, reacts in the dark, and increases the photosensitivity of the eye, as long as there is vitamin A, it can be continuously synthesized in the dark place to increase vision, about 20 minutes, reaching the highest, which is also commonly known as adapting to the night.

In the Northern Song Dynasty, night blindness was common because of a lack of vitamin A.

Vitamin A, a large amount of contained in meat, and some special plants, is a difficult problem to solve in the era that has not yet developed.

Take the Northern Song Dynasty as an example, in the Northern Song Dynasty, the salary of a city gate official may be higher than that of a king in Europe, and he can guarantee to eat meat every day.

But the city gate officials, no matter how they are, are still officials, and the bureaucrats in the Northern Song Dynasty are very well paid, which is completely different from the common people.

Really to the bottom, even if it is an ordinary small landlord, at most it is full of food and wants to eat meat, which is very difficult.

Ordinary peasants can't even eat enough, so it's too luxurious to eat meat.

Most of the farmers will raise pigs and chickens, but there will not be too many of them, and almost none of them can enjoy this kind of thing.

Those who burn charcoal can't afford to burn charcoal, pigs can't afford to eat meat, and silkworms can't afford to wear ayaluo, which is a common thing in ancient times.

Vitamin A is widely distributed in all kinds of meat, and there is no way to supplement vitamin A from meat, so this will definitely be deficient, and night blindness is also the most common phenomenon.

Among all the malnutrition diseases, the most unbearable for Zhao Xin is night blindness, the industrial society is seizing the day, efficiency must be taken into account, increasing labor hours, or people stop the machine does not stop, this is the efficiency of industry.

Especially for some machines, sometimes, it takes time to turn on and off, coupled with the Q&A on the utilization rate, many factories in later generations are three and four shifts, so that people stop the machine non-stop, and the daily work efficiency will be improved a lot, and the efficiency of the factory will also be improved.

After Zhao Xinding settled in the navy, at the beginning, in addition to construction, he made kerosene and kerosene lamps, which solved the problem of lighting at night and expanded the time for people's activities on a large scale, but this kind of lighting could not solve night blindness.

The existence of night blindness, the brightness of the plant, to improve to a very high degree, otherwise most people can not see, but also must end at a certain time, such a bright light environment, not suitable for long-term work.

Even in the 21st century, it is more difficult to make light than the United States and daylight, and there are more or less reasons, not to mention that in the Northern Song Dynasty, under the premise that kerosene lamps are the mainstream of lighting in factories, working under this kind of light for a long time will not only exacerbate night blindness, but also cause many ophthalmic problems.

Similarly, compared to other forms of malnutrition, night blindness is also one of the most easily resolved forms of malnutrition.

As long as it is not caused by disease, most of it is just a problem of vitamin deficiency, as long as you increase your vitamin intake.

This is actually the solution to vitamin deficiency, what is missing, make up for something, and once it is replenished, it can solve the problem.

In the Age of Discovery, it was terrifying, and in the Age of Discovery, the largest number of deaths and the most terrible sepsis could be solved with just a little vitamin C.

Night blindness is not fatal, and it is not clear to see clearly at night, as long as large-scale vitamin A supplementation allows the eyes to have the ability to synthesize rhodopsin, night blindness will be cured.

As long as vitamin A is supplemented, once it is solved, not only the entire combat effectiveness of the navy can be improved very high, at the same time, the production capacity can also be further released, and the lighting can be taken into account for a long time at night, not particularly bright, as long as the visibility can be, the efficiency will be significantly improved.

Cheap supplements of vitamin A, in nature, are only those rich in carotene, now, from the introduction of carrots into China, there are still a century or two, the same, this kind of healthy vegetables in later generations, on the taste, really like, there are not few, and there is no other economic role, there is no way to spread widely,

In addition to carotene, some dark green vegetables also contain carotene, but in this era, the vegetables of the Northern Song Dynasty were only when weads and radishes, and many dark green vegetables have not yet been found or developed.

In fact, vegetables, which were gradually proposed in the 21st century under the premise of advocating a healthy diet, supplemented with vitamin A, the best, is meat, especially animal liver.

These foods contain a large amount of vitamin A, which is different from carotene, which can be directly absorbed by the body and has a direct effect on night blindness. 、

On the premise of basically solving the problem of food and clothing, increasing food diversity and reducing the proportion of food itself in the diet structure is very important for improving the quality of the human body.

Not to mention, vegetarianism is not good, but under the premise that the human body quality has not even reached a benchmark, excessive requirements for vegetarianism are not conducive to the overall development.

If it weren't for Zhao Xin's raised wages, if it weren't for the establishment of a perfect guarantee mechanism for the entire Dinghai Navy, would the raised wages given by the Dinghai Navy really improve everyone's quality of life?

Of course, this is impossible, in the region, if food or other necessities are limited, rashly increase the proportion of wages, so that the whole region has more money, and prices will skyrocket.

Zhao Xin can improve the efficiency of many things, but there is one thing that is really not so easy to improve, and that is the growth of living things.

Dinghai has begun to promote the breeding industry in the scope of the Northern Song Dynasty, but the speed of this promotion is not fast, there is no good enough feed for livestock, and it is very difficult to raise animals on a large scale.

It is certainly not cost-effective to use grain, and the cost is too high, even if large-scale breeding is popularized, the price of meat cannot be greatly reduced.

In fact, this is also the fundamental reason why meat is expensive, if you eat 1 pound of meat per day, it is 30 pounds a month, and ordinary pork is almost 2.4 pounds, such a high cost, unless it is a noble, otherwise the average family, even the landlord, can not afford it.

Dinghai can, the salary level of ordinary people is 30 guan, a little more skilled, there is no problem to get 50 guan, a person eats a pound a day, it is only 2.4 guan, drizzle.

However, money may not be able to buy meat, there is no large-scale breeding, there is no private chat, all kinds of meat to very difficult, in the grasslands in the north, you can also graze cattle and sheep, but in the Central Plains, in the south, what to do.

Conventional meat, most of which are free-range pigs in rural areas, can only grow in a year, or even two years, by beating pigweed, leftovers, and some other supplements.

This is also something that the Navy has no choice about, for other materials, there are no restrictions, as long as you have money, you can buy as much as you want, but for meat, it is quantitative.

At present, the Dingjun Navy has worked hard to collect meat from many places, as well as from the northwest, which consumes a huge amount of energy, and the transshipment is just to ensure that no one averages 2 catties of meat per month.

This amount can only satisfy the cravings of ordinary families, but cannot completely solve the problem of night blindness.

This cannot be blamed on the officials of the Dinghai Navy, it is difficult for a clever woman to cook without rice, and even if the Dinghai Navy is rich, it is impossible to buy all the meat, and people may not be willing to sell it.

The population is so large that the average of any one point can become a frighteningly large number.

The Dinghai of 2 million people, if you have 2 catties a month, it is 4 million catties, and according to a pig of 200 catties, a month, it is 20,000 pigs.

This number, even in the 19th and 20th centuries, is a terrible number, and only the great China of the 21st century can ignore this, but in this era, it is an almost unsolvable problem.

It is expected that by this time next year, the population of Dinghai can grow to 4 million, which is not 20,000 pigs, but 40,000 pigs, which is even more difficult to solve.

In later generations, the huge size of the aquaculture industry can even lead to a few richest people for a long time.

Feed is a key factor in the large-scale expansion of the aquaculture industry, and the rapid growth, Zhao Xin of course knows, the disadvantages of feed feeding, those meat, and domestic, stocking, the difference is huge.

But now, it is not the time to consider quality, quantity is to a certain extent, and after a certain situation, quality can be considered.

It takes time to increase the amount of meat without the king of natural foods like corn.

Other meat, although a large amount of investment, the sales volume in Dinghai is not high, the base price is too high, Dinghai has never made money on this, more to protect as much as possible.

This time, under their competition, Zhao Xin thought of fish, especially the deep-sea marine fish. And then he thought about the fishing industry of the ocean, and therefore, after thinking about it, he finally decided not to support any of them's request, and made a fishing boat.

Once a large number of fishing boats appear, the fish caught in the ocean can solve the night blindness of the Dinghai Navy and let the industry of the Dinghai Navy once again give wings.