Eyes and glasses 5, glasses what kind of mirror

The function of glasses is to correct the vision of the eye, so that people with vision problems can see clearly, but if there is a problem with vision, in addition to wearing appropriate glasses to correct, you should also pay attention to:

1. The time of close eye use should not be too long, every 40-50 minutes, you should take a little rest for 3-5 minutes, and look into the distance to relieve visual fatigue.

2. Read and write, play with the computer, maintain a correct posture, the height of the table and chair should be appropriate, and the distance between the eyes and the reading materials should be about 33 cm.

3. Mix whole grains, meat and vegetables, eat more vegetables and fruits, and don't eat partially. Lack of vitamins in food is prone to night blindness and dry eye disease, and lack of trace elements chromium and calcium in food makes it easy to suffer from myopia. In addition, it is also necessary to pay attention to regular supplementation of eye vision nutrients, not from the nutrients required by the eyes, enhance the anti-fatigue ability of the eyes, and better protect the eyesight.

Fourth, when reading and writing, the light should be moderate, not too strong or too dark, and the light should come from the left front, so as not to obstruct the vision of the hand shadow. The light should be soft, if it is incandescent, it should be between 25 and 40W, and it is not recommended to read in the sun. Because the intensity of light has a direct impact on pupil dilation, too strong light will increase the intensity of eye accommodation, aggravate the intensity of eye labor, and it is easy to cause myopia after a long time.

Generally, desktop lamps should be less than 40 watts.

5. Avoid reading while walking or reading in a walking car. Because the carriage is shaking, the body is shaking, and the distance between the eyes and the book cannot be fixed, the burden on the glasses will increase. Often, this is likely to lead to myopia.

6. Actively participate in physical exercise to enhance physical fitness. As the eyeball follows the target, the ciliary muscles continue to relax and contract, and the synergistic effect of the extraocular muscles can increase the blood perfusion of the eye, promote the metabolism of the eye, and thus reduce eye fatigue. Moreover, the quality of physical fitness is also closely related to the occurrence of myopia in children.

Malnourished and weak children are prone to myopia.

7. Insist on doing proper eye exercises. By massaging the acupuncture points around the eyes to enhance the blood circulation of the eye socket, improve neuronutrition, eliminate the excessive congestion in the eye, and achieve the purpose of relieving eye fatigue, it is conducive to the prevention and treatment of pseudomyopia in adolescents, and is a good way for adolescents to self-care their eyes.

8. Eat less candy and high-sugar foods. Too much sugar will produce a large amount of acidic substances in the blood, and the acid will combine with the salt in the body, especially calcium, resulting in a decrease in blood calcium, which will affect the toughness of the eye wall, make the eye axis easy to elongate, and promote the occurrence and development of myopia.

Glasses can make people short-sighted.

The object is imaged on it.

The lenses of myopia glasses are concave lenses. The image formed by the concave lens is always smaller than the object's, the upright virtual image, the concave lens is also called the negative ball lens, the middle of the lens is thin, the edge is thick, and it is concave, so it is also called the concave lens. Concave lenses have a divergent effect on light.

The geometric mapping of concave lens imaging is the same as that of convex lenses. From the top of the object, it also acts as two straight lines: one is parallel to the main optical axis, which is deflected into divergent light after passing through a concave lens, and the refracted light is returned to the main focus in the opposite direction; The other is the image of the object through the optical center point of the lens, where the two straight lines intersect at one point.

After the parallel rays are deflected through the concave spherical lens, the rays diverge and become divergent rays, and it is impossible to form a solid focus, and along the reverse extension line of the scattered rays, they intersect at point f on the same side of the projected rays, forming a virtual focus.

Yes, there are bright moon lenses, and there are colorful myopia sunglasses.

Bright Moon Colorful Myopia Sunglasses, myopia sunglasses are combined into one, which can not only block ultraviolet rays but also have super high appearance, and ordinary myopia glasses, sunglasses are easy to leave fingerprints; The colorful myopia sunglasses of Mingyue lenses are equipped with the unique Tianshi A6 film of Mingyue lenses, so that the lenses are not easy to leave fingerprints and can be used for a longer time.

And there are many colors of colorful myopia sunglasses with bright moon lenses, look at the picture below Mingyue lenses and intelligent color-changing lenses, simply put, in strong light, the lenses will become sunglasses, and in low light, they will become ordinary lenses, which is also very suitable for your needs.

As for **, it depends on the person, I think it's very expensive, after all, you get what you pay for.

Yes, it is dyed lenses, and you can dye them in any color. Slightly better are also polarized lenses for myopia, which are colored and a little better for the eyes. A few hundred ordinary tinted lenses are fine, and polarized lenses are slightly more expensive.

The cost of this kind of glasses is mainly directly related to the selected manufacturer and material, generally ranging from three or four hundred yuan to more than one thousand yuan, and you can choose according to your own economic ability.

In addition, it should be noted that if you are myopic under the age of 18, you should pay attention to correcting bad eye habits while wearing suitable glasses, and cooperate with oral eye vision nutrients to fundamentally supplement eye nutrition and control or improve eye vision. This can reduce the impact of myopia on later work and life.

Sunglasses are a kind of glasses, which are glasses that can block the sun's rays, and they are "labor protection" products to protect the eyes under strong light. Wearing this lens can block ultraviolet and infrared rays, and at the same time, the color of the external environment does not change, only the light intensity changes, as if it is cloudy, and there is a cool and comfortable feeling.

Polarizers are lenses made according to the principle of polarization of light, which are used to eliminate and filter out direct light in the beam, so that the light can be put into the visual image of the eye on the correct light transmission axis, so that the field of vision is clear and natural. It is mostly used for sunglasses and camera lenses.

Differences: Although polarized lenses can filter out many irregular light interferences and avoid the occurrence of dazzling and dazzling phenomena, compared with sunglasses, if the arc of the lens itself cannot be in an optical standard refractive state, the polarizing effect will be weakened, affecting the authenticity of the image, and the durability is poor.

Polarized sunglasses on the market are made of fibers sandwiched with polarizing film. It is different from the optical glass polarized solar simple hand lens, because of its soft texture and unstable arc bending, after the lens is assembled on the frame, the lens is difficult to meet the optical refractive standard, and the vision is loose and deformed. Due to the instability of the arc bend, the lens is deformed, which directly leads to poor clarity of light transmission and image distortion, which cannot play a normal optometric effect.

And the surface is easy to scratch and wear. Not durable.

1. The manufacturing purpose of functional glasses and ordinary glasses is different.

2. Ordinary glasses are the eyeballs to adapt to the glasses, and the prescription rises year by year. Functional glasses can automatically adjust the function with the change of the ring and closing environment, instantly change the visual perception to protect the health of the human eye, and achieve the effect of "the glasses can automatically adjust the function to actively adapt to the eyes and improve vision at the same time".