分类： Eyeglasses

分类
Eyeglasses

Data required for glasses

Data required for film matching: spherical degree / SPH, astigmatism degree / CYL, astigmatism axis / axis, pupil distance / Pd (if there is astigmatism, there must be axis position; if there is no astigmatism, only the degree and pupil distance are required)

Standard Online Eye Glasses Prescription degree format (example) — Note: it must be written in the order of top right and bottom left

R (right Eyeglasses): – 500 / 125 * 180 (spherical degree SPH / astigmatism degree CYL * astigmatism axis)

L (left Cheap Eyeglasses): – 450 / 175 * 175 (spherical degree SPH / astigmatism degree CYL * astigmatism axis) (Note: if there is astigmatism, there must be axis position)

PD: 62 (pupil distance Discount Glasses)

分类
Eyeglasses

The following situations are not suitable for wearing contact lenses

Menstrual women often have higher intraocular pressure than usual, and they are more prone to congestion around their eyes, especially women with dysmenorrhea. At this time, if they wear contact Gradient Tint Prescription Lenses, they will have adverse effects on their eyes.

During pregnancy, the hormone secretion of women changes, so that the water content in the body also changes. The eyelids are swollen and the cornea becomes thicker, which will not coincide with the contact Glasses Lens Index selected at normal time, resulting in eye discomfort. Pregnant women with pregnancy edema should not wear contact Eyeglass Lenses Online in particular.

Cycling long-distance travel reduces the moisture of soft contact lenses, the lenses gradually dry and harden, and the eyes will feel uncomfortable. Over time, the hardened Buy Lenses For Glasses will damage the cornea, causing eye pain or bacterial infection.

分类
Eyeglasses

How to choose Sunglasses without hurting your eyes

Transition Lens Sunglasses are now very common. It has become an indispensable part of people’s dress up fashion. Then choose sunglasses. The choice of sunglasses is also particular. Choose sunglasses that don’t hurt your eyes

When choosing Magnetic Clip On Sunglasses, in addition to the requirements for their styles, many people often have the idea that the darker the sunglasses, the better. But is this idea really scientific?

It is reported that one of the main functions of Mens Clip On Sunglasses is to filter ultraviolet rays. As long as they are UV treated sunglasses, the UV index can reach 96%% to 98%. That is to say, even light sunglasses will achieve the same anti ultraviolet effect as dark sunglasses after UV treatment. Therefore, the anti ultraviolet function of sunglasses has nothing to do with the depth of its color. On the contrary, if you wear dark Clip On Sunglasses for a long time, it will be difficult for your eyes to see objects and easy to get tired.

分类
Eyeglasses

Choose sunglasses to be real and natural

Choose Cheap Sunglasses to look real and natural, and the color of the scenery cannot be distorted. The lens color should be medium gray, tan and green

What should we pay attention to when choosing Cheap Designer Sunglasses? No matter what color you choose, you should first pay attention to the anti ultraviolet mark. Anti ultraviolet is the primary function of sunglasses. Some sunglasses have “100% anti ultraviolet”, “UV400”, “anti ultraviolet” and other marks on the lens or package. If you wear inferior sunglasses that cannot block ultraviolet rays, more ultraviolet rays enter your eyes than when you don’t wear sunglasses, which is more likely to cause eye damage. Regular eye shops generally have instruments to detect the UV protection ability of Designer Mirrored Sunglasses.

The color selection of the lens shall be based on the principle that the color of the surrounding environment is not distorted, the edge of the object is clear, and the signal lights of different colors can be effectively identified. The colors of the lenses are gray, tan and green, because the lenses of these colors have better absorption of infrared and ultraviolet rays. The gray lens can absorb any chromatogram evenly, and the scenery seen after wearing the lens will only darken without obvious color difference; The tan lens can filter out a large amount of blue light and improve the visual contrast and clarity. It is especially good when worn under the condition of serious air pollution or foggy. In addition, we should also consider the selection of materials, styles, polarizing, photosensitive (Cheap Mirrored Sunglasses) and other functions.

分类
Eyeglasses

Soft contact lenses

Soft contact Gradient Tint Prescription Lenses (SCL) is a hydrophilic synthetic polymer compound, which can be divided into low water content (30%), medium water content (30% ~ 60%) and high water content (60%) according to the water content. The high water content makes the High Index Lenses Meaning soft, elastic, good oxygen permeability, and there is no obvious sense of foreign matter at the beginning of use. However, because it is a soft material with water content, it is easy to be polluted or moldy, so it must be strictly disinfected. In addition, compared with hard contact Transition Lenses, it has poor astigmatism correction, and special astigmatism lenses need to be used, with a service life of 1-1.5 years. Wearing comfort is a big feature. The Eyeglasses Transition Lenses is large (12.5-14.5mm) and fully covers the cornea. It is not easy for dust and foreign bodies to enter the eye, shift and fall off. It is very suitable for sports activities.

分类
Eyeglasses

Choose appropriate myopia glasses

Choose lenses made of materials with high refractive index: this kind of lens has a stronger refractive index than ordinary lenses, so it can be made thinner. The surface of high refractive index lens has strong reflection, so it is easy to use the lens with anti reflection coating. Choose aspheric lens: this kind of lens is thinner than that of spherical lens at the same degree, with light weight and less optical deformation.

Do not use rimless spectacle Glasses Frames For Women: because the edges of these Glases Women are not wrapped by frames, it is easy to see the thicker lens edges from the side. At the same time, they are not surrounded by Eye Glass Frames, and the height of the lenses is unstable.

Choose resin lens: for most patients, it is better to choose resin lens, because the weight of plastic lens is only half that of Womens Eyeglasses lens, with good anti ultraviolet function, not easy to break and easy to dye. Choose polycarbonate lenses: these lenses are not easy to break and are especially suitable for children and athletes. Patients with myopia wear polycarbonate lenses with a diopter above -7.00, and there may be scattered color lines when looking at the light through the periphery of the lens.

分类
Eyeglasses

Learn to understand the product logo

Not all Cheap Designer Sunglasses have the function of anti ultraviolet. A pair of sunglasses that meet the basic requirements of the standard can only be said to block the strong light without passing through more ultraviolet light. If a pair of Cheap Sunglasses can only block strong light but not the same amount of ultraviolet light, the wearer will accept more ultraviolet light than without Designer Mirrored Sunglasses (wearing sunglasses will reduce the flux into people’s eyes and increase the pupil of the wearer). The sunglasses sold on the counter of the store generally have obvious signs on the lens, tag or outer package, just like the fabric composition on the clothing. Consumers must check carefully when buying.

We know that different types of sunglasses have different application occasions and groups. If we want to buy Cheap Mirrored Sunglasses, we must first determine whether the purpose of our purchase is to shade or decorate clothes? Are there any requirements for anti ultraviolet function other than sun shading? Are there any special requirements for the safety performance of lenses? Only by clarifying these purposes, combined with the style and the actual effect on my face, can I buy a pair of suitable sunglasses.

分类
Eyeglasses

Degree selection and astigmatism relationship

There is a conversion formula for the degree of Clear Frame Glasses lens and contact lens: fo = FS / (1-dfs) fo – the degree of contact lens FS – the photometric number of frame lens D – the distance between frame lens and cornea (0.012m)

For example, if the power of the Transparent Eyeglasses frame lens is -4.00d and the distance between the frame and the contact lens is 12mm, the power of the contact lens can be converted into fo = 4.00d / [1-0.012 (- 4.00)] = -3.82d, which can be given as -3.75d.

(- below 4.00d, negligible due to small difference)

If the Tortoise Shell Frames lens power is 4.00d to 5.00d, the contact lens power is: myopia minus 0.25D, hyperopia plus 0.25D;

If the frame lens power is 5.25d to 7.00d, the contact lens power is: myopia minus 0.50D, hyperopia plus 0.50D;

If the frame lens power is 7.25d to 9.00d, the contact lens power is: myopia minus 0.75D, hyperopia plus 0.75D;

If the Tortoiseshell Glasses Frames lens power is 9.25d to 10.00d, the contact lens power is: myopia minus 1.00d, hyperopia plus 1.00d.

If there is no corresponding degree after the conversion of a degree, you can choose the degree close to the lower one. For example, if 800 degrees is reduced by 75 degrees, it is 725 degrees. If there is no 725 degrees, you should choose 700 degrees, and so on.

分类
Eyeglasses

Correct selection of astigmatism lens

As a medical product for correcting eyesight, contact lenses are by no means ordinary consumer goods, and the purchase of contact lenses is not simply a commercial behavior, but has a certain degree of medical professionalism. For example, the degree of contact lenses is generally lower than that of Glasses Frames, and the specific value should be converted; Astigmatism patients should customize special astigmatism Clear Eyeglasses lenses; People with sensitive eyes can choose materials with higher water content to buy according to the examination results and suggestions of professional doctors, so it is better to buy contact lenses in the hospital ophthalmology or regular glasses shop.

On the premise of the same material, the higher the water content, the better the oxygen permeability, the softer the lens, and the more comfortable to wear. Because of this, many people simply understand that the higher the water content of the lens, the better. Is this the case? Of course not. In fact, if the water content is higher than 50%, the Transparent Eyeglasses is easy to be damaged and deformed, and it is easy to attach protein and other sediments, which is unfavorable to the astigmatism correction ability. Therefore, it is generally only used for day throwing Clear Frame Glasses; On the contrary, the lower water content can be used to prolong the service life of the lens, reduce the attached sediment, correct slight astigmatism and other favorable factors, and can be used for semi annual and annual contact lenses.

分类
Eyeglasses

Please choose contact lenses carefully

A considerable number of students have high or low myopia due to various reasons. In order to be convenient and good-looking, some people choose contact lenses, and businesses also take the opportunity to play a variety of patterns, multi-color contact lenses, Eye Glass Cheap with longer wearing time, etc In fact, students should not wear contact lenses too early.

To wear glasses scientifically, frame Eye Glasses Cheap Online should be a better choice, and students are not encouraged to use contact lenses prematurely. The incidence rate of myopia is generally high. The main reason for this is Congenital heredity. There is no prevention and treatment method for the time being. There Cheap Glasses Frames is no way to prevent development. Only optical correction and surgical correction are necessary. Second, it is caused by the bad visual environment after tomorrow, which accounts for the majority of teenagers. It is mainly caused by using eyes, reading and writing, watching TV and computer for a long time. There are also sitting posture, pen holding posture is wrong, the distance between Cheap Eyeglasses and books is too close, the illumination is not enough, and lying, lying down and reading by car will lead to myopia.

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