What are the disadvantages of wearing flat glasses, and what are the advantages and disadvantages of

1. Flat lens is glasses without diopter, neither myopia, nor farsightedness, nor astigmatism.

2. If you are nearsighted, it is best not to wear glasses, and you can pay attention to it at ordinary times (do not read books at close range).

However, it is important to choose a good flat mirror.

Flat glasses, has the effect of blocking wind and sand and beauty, some can also prevent the impact of ultraviolet or infrared rays on the eyes, as far as the lens glass material is concerned, there are light white mirrors, color change lenses, coated lenses, crystal lenses, Kesi mirrors, Kesai mirrors, etc.

Quality features: The quality of lenses is divided into three grades: high, medium and low, or excellent, first grade and second grade. The higher the quality, the greater the transparency and the more protective it is for the eyes.

Counterfeit products. Mainly counterfeit, imitation or shoddy into imported famous brands and domestic famous products, such as, "imitation Kangming" and so on. These products are characterized by poor materials, different background colors, poor processing, low surface finish, and inaccurate gloss; The color of the material is not correct, and there are more impurities such as bubbles and stones; Under the stress meter, it can be found that there is a large stress; The packaging is not standardized, there is no qualified mark, etc.

Defective characteristics. In addition to some of the characteristics of the above-mentioned counterfeits, defective products also have chipping, scratches, trachoma, lines, etc., some lenses have inaccurate refractive degree, some have a lower finish, and some lenses have a center thickness of less than 0 7mm, which is fragile and hurts the eyes.

Identification method: 1. Identify the surface finish. It can be distinguished under a 60-watt incandescent lamp with the help of a black background. High-quality products should not have obvious scratches, pitting, chipping, sand holes, water ripples, bubbles and other surface defects.

2. Place your glasses about 33 cm in front of your eyes, and when you look at objects through them, there should be no obvious enlargement or shrinking, and there should be no sense of movement. Otherwise, there is a problem with the quality of the glasses.

3. Through the identification of the instrument, it is better to have three tablets without changing the degree and no clutter.

4. Check whether the trademark, manufacturer, and quality certificate are true and reliable, and the lens of international famous brand products is often engraved with the manufacturer's trademark, which can be found by careful observation on the edge of the lens.

A bad flat lens is damaging to the eyes!

Wearing flat glasses generally does not cause vision changes, but if you wear glasses just for the sake of wearing glasses, you can wear flat glasses without lenses can not prevent myopia, have the effect of blocking wind and sand and beauty, and some can also prevent the impact of ultraviolet or infrared rays on the eyes. However, if some materials are not good, it may cause myopia or myopia deepening.

Flat glasses usually refer to glasses without any prescription, which have the benefits of avoiding damage to the cornea by foreign bodies and blocking ultraviolet rays, but if worn for a long time, it may also cause visual fatigue and vision loss.

1. Benefits: Flat glasses can be divided into ordinary flat glasses, anti-blue light flat glasses and color-changing flat glasses, etc., although they cannot be used to correct vision problems such as farsightedness, myopia, astigmatism, etc., they can be used to resist foreign bodies such as wind and sand, insects, etc., so as to reduce the damage to the eyes from the outside world. In addition, if you choose anti-blue light flat glasses or color-changing flat glasses, they also have a certain anti-blue light and ultraviolet blocking effect, which helps to protect your eyes;

2. Disadvantages: If you wear flat glasses for a long time, it may compress the ears and nose, cause local discomfort or slight depression, and there may also be symptoms such as pain, dizziness, redness and swelling around the orbit. If the lenses are worn, long-term wear may also cause visual fatigue, resulting in blurred vision, vision loss, etc., affecting daily work and study.

1. Flat glasses are a general term for glasses without diopters, which are used to distinguish them from myopia glasses and reading glasses. Does it have no myopia, no farsightedness, and no astigmatism? For those in the north, flat mirrors can block wind and sand; For the host of film and television programs, flat mirrors can change temperament and play a decorative role.

2. Benefits: According to the different mirror layers, the functions are not the same. In the case of lenses alone, there are different coatings, and the function is determined by the coatings.

If it is a hard coating, it can correspond to wear resistance; If it is an anti-fatigue coating, it can reduce radiation; If it is an easy-to-clean film, it can be easily cleaned. UV protection can only be tested under sunlight or UV instruments with a special test card, which is difficult to identify with the naked eye.

3. Wearing flat glasses often naturally has certain disadvantages: first of all, the lens of the flat lens is an ordinary plastic sheet, which is to protect the shape of the frame, but the plastic lens will have an adverse impact on vision. The sunglasses bought on the market should have flat glasses, but some low-quality products have prescriptions, and consumers will experience symptoms such as dizziness, headache, eye soreness and tearing pain after wearing these glasses for a period of time, and long-term wearing will cause vision loss.

Even rimless large-framed glasses can aggravate visual fatigue if they are placed on the bridge of the nose for a long time. In addition, people who do not wear glasses have a large range of eye movements, and the surrounding muscles are moved and become developed and resilient; The movement of the eyeballs of people who wear eyes (including people who wear flat glasses for a long time) is only limited to the viewing angle limited by the glasses, and can not be completely rotated up and down, left and right, so some muscles have been skillfully exercised and become developed, and some are idle, this difference has caused the basis of eye deformation, and then the bad eyeballs are gradually convex forward in order to adapt to things through glasses, so they gradually bulge forward to obtain a larger angle of view and see a wider range, so the eyeballs are more likely to be deformed.

4. So generally speaking, if there is no problem with vision, it is best not to wear flat glasses. If it is said that the eyes are occasionally tired, and the slag line key is not myopia, then you can correct the bad eye habits, and with oral eye vision nutrients, insist on taking it for a period of time, and the eye fatigue will be restored.