How long does a pair of plastic glasses last? Is lens wear harmful to the eyes?

The use cycle depends on the quality of the lenses and the daily use, but generally speaking, no matter how bad the lenses are, there is no problem with them for half a year and a year, the lenses will be harder than usual to see things, and it will also cause the degree to deepen over time, so after spending it, go to change a pair of lenses, which is the best, and you can also check it when you wear glasses to see if there is any change in the prescription, and you can adjust it in time.

It doesn't matter, the lenses can be removed by yourself and then replaced with new ones, it is recommended that you replace them if they are worn, and the frames do not need to be changed all the time, because there is no need.

The maintenance principle of plastic lenses is to keep the lenses bright and clean, free from oil stains, and avoid scratches. It is best to rinse the lenses with tap water before wiping them, or you can use neutral soap or special detergents to clean them with clean water.

Wash the seams between the frames and gently scrub them with a soft, old toothbrush to remove dirt. In daily life, the lens should be avoided from contact with high temperature, because at high temperature, the thermal expansion and contraction of the film and the lens substrate will be inconsistent, resulting in damage or even falling off of the film.

It is also important to avoid exposing the lens to strong organic solvents such as acetone, ether and perfume, which can affect the finish of the lens surface.

The way to place the glasses should also develop a fixed habit, first wrap the lenses with flannel, and then close the temples, in order to prevent the glasses from being under heavy pressure, you can place the glasses in a hard glasses storage box. When wearing glasses, do not contact the convex surface of the lens with hard objects, and it is best to store it in a case.

Plastic lenses should be rinsed with clean water first, then cleaned with a special detergent for plastic lenses or a small amount of detergent, and finally dried with a special cloth for plastic lenses. Wipe with a special lens cloth for plastic lenses, because the ordinary lens cloth is loose and easy to be mixed with sand particles, which will wear the lenses, so it is best to rinse the lenses with clean water first, and then dry them with a proprietary lens cloth.

Plastic lenses should be replaced in 2-3 years. Most of today's spectacle wearers do not pay much attention to the cleaning and maintenance of lenses, which often causes lens scratches and cracks, shortening the overall service life of plastic lenses, and "overdue service" lenses are easy to accelerate myopia due to visual fatigue due to problems such as reduced light transmittance.

Care and use.

1. When the glasses are not worn, they should be placed in the case, and the outer surface (outer surface) of the lens should not be in contact with hard objects.

2. Rinse with tap water before wiping the lenses. If there is oil, you can drop a little dishwashing detergent and rinse it off with tap water, then blot it dry with a soft paper towel.

3. Use a special fiber cloth to wipe the lens. If the cloth is dirty, it can be washed before use.

As long as your eye power does not change, the lenses are not worn, and you can wear them for many years. However, it is recommended that it is best to check the power of the eyes regularly, which can be done once a year.

As long as the plastic lens is not deliberately damaged, or the degree of myopia is no longer suitable for this lens, it should be used all the time.

with plastic lenses.

Good everyIf the lenses are "out of service", they are likely to cause myopia in the eyes.

The power is deepened. The surface of the plastic lens is easy to be worn, under normal use, after 2 to 3 years, the lens is basically worn out and begins to become blurry, and the user often has to rely on the eyes themselves to adjust the distance of vision, which will aggravate the degree of myopia. If you don't use it properly, the lenses will wear out even earlier.

At the same time, patients with myopia should generally re-optometry and adjust the power in about two years. Therefore, plastic lenses will be "replaced" in 2 or 3 years.

The plastic lens slide has a certain service life, excluding the influence of eye power factors, and it is usually recommended to replace it in about 2 years.

As the lenses are used for a long time, there will be a certain degree of wear and tear, which is easy to cause eye fatigue, and it may increase the number of clear field depths, so it is not recommended to leave them unreplaced for too long.

Resins can be divided into two types: natural resins and synthetic resins. Natural resin is a hydrocarbon (hydrocarbon) secretion from a variety of plants, especially pine and cypress plants. Because of its special chemical structure and the fact that it can be used as an emulsion paint and adhesive, it is valued for its use.

Since it is a mixture of various polymer compounds, the melting point is also different.

There are many types of resins, which are widely used in light and heavy industries, and can often be seen in daily life, such as plastics, plastic glasses and coatings. Resin lenses are lenses that are chemically synthesized with resin as raw materials and processed and polished.

Plastic lenses have a lifespan of 2 to 3 years. Lenses are transparent materials made of optical materials such as glass or resin, with one or more curved surfaces, and the lens is one of the lenses, and the production material comes from the secretions of pine and cypress plants, which has the advantages of light weight and not easy to break, and has a long service life, but in order to ensure the use effect, it is best to replace it in time.

How long do plastic lenses last.

Mirror anti-beam is a transparent material made of optical materials, with a number of curved surfaces, which can be processed and polished to be assembled into glasses with the eyeglass frame. Lenses have many classifications, according to the production material can be divided into glass lenses, plastic lenses, PC lenses, according to the function can be divided into daily general lenses, anti-blue light lenses, sunglasses, sports lenses, etc., according to the surface processing can be divided into spherical lenses and aspherical lenses.

Plastic lenses are one of the lenses and the most common one in everyday life. The raw material for the production of plastic lenses is resin, which has the advantages of light weight and non-breakability. Resin is the secretion of pine and cypress plants, is a mixture of a variety of polymer compounds, has a wide range of applications in industry, in addition to making lenses, can also be used to make plastics and coatings.

Plastic lenses have an expiration date, and ideally, they can be used for two to three years before they need to be replaced, and plastic lenses that are beyond their expiration date will cause problems such as reduced light transmission, resulting in symptoms such as eye fatigue. However, if you do not pay attention to cleaning or maintenance during use, the service life of plastic lenses will be further shortened.

The lifespan of plastic lenses is half a year. The lens begins to turn yellow after about 2 months, which will reduce the transmittance of the lens, affect the clarity of vision to a certain extent, and because the lens will be scratched during use, it will also form a certain impact, resulting in visual fatigue.

Not good for the health of glasses.

Plastic lens is a lens made of organic materials, the inside is a polymer chain structure, connected and three-dimensional network structure, the intermolecular structure is relatively relaxed, and there is space between the molecular chains to produce relative displacement. The light transmittance is 84%-90%, the light transmittance is good, and the optical plastic lens is resistantImpactStrong.

Resins can be divided into two types: natural resins and synthetic resins. Natural resin is a hydrocarbon (hydrocarbon) from a variety of plants, especially cypresses.

Secretion. Because of its special chemical structure and can be used as an emulsion paint.

and adhesive use are valued.

Replace the glasses with a pair after two years of wearing.

Plastic lenses are likely to cause accelerated myopia if they are "out of service", but most spectacle wearers know little about this. Several optometrists reminded the public that in addition to regular optometry, the public should also regularly strengthen lens care and renew lenses as soon as they are found to be "out of service".

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As a special commodity with medical properties, glasses need regular maintenance and inspection, and timely update to keep them in good working condition. Compared with glass spectacle lenses, plastic spectacle lenses have the advantages of small lens weight and not easy to be broken, but plastic lenses also have low hardness, easy to scratches and cracks, once there are scratches, it will obviously affect its optical correction performance, reduce light transmittance and other problems, which can easily lead to eye fatigue. Many people wear glasses until they break them or become unusable.

In particular, plastic lenses should not be "overstayed", and it is advisable to replace them in 2 to 3 years. Once the plastic lens is scratched and cracked, it should be renewed immediately.

Plastic lenses are lightweight and easy to carry, but they are easy to scratch, and special attention should be paid to lens maintenance so that they are always in good working condition. When using resin glasses, clean the spectacle lenses regularly to maintain good clarity. If it is stained with grease, you can clean it with dish soap or neutral soap, and clean it with water, and then dry it naturally, or gently wipe off the water with a soft tissue or glasses cloth, try not to rub the spectacle lens directly when wiping the water, and do not scrape it with a sharp and hard object.

When wiping the glasses with a cloth, you should wipe them in one direction to avoid slight scratches when wiping them in multiple directions.