Farsightedness lenses are not framed

Let me explain it to you.

The power of the convex lens lens of the farsighted eye is reduced, generally speaking, the same material, the same brand, the center thickness will be reduced, but seven or eight, it is not too obvious. However, the center thickness can be measured with a top power meter.

If the degree is reduced from the original 800 degrees to 700 degrees, and the degree of heterophoria does not change, the eccentricity distance should be increased, that is to say, to make lenses with the same prism, the frame at this time should be smaller, otherwise it will definitely not be done, or the eccentricity is not enough, partly because the diameter of the general convex lens is much smaller than the concave lens of myopia.

Regarding Meigong, I think it is the trimming, it is recommended to choose a full-frame, lighter frame, and the trimming technique should be based on the rim.

1.The size of the glasses frame this time is different from the last time, because the child is growing up, 2It may be that the data of the light shifter this time is different from the last time, for example: the last time the light shifter was unilateral 5mm, and this time the light shifter is 6mm

3 Your lenses are custom-made lenses, even if a factory produces lenses of one prescription, the customized lenses will have different thicknesses due to different batches.

1. The lenses of all myopia glasses and farsighted glasses are lenses, and the myopia glasses are thin and thick; Farsighted glasses** thick with thin edges. The lens used for myopia is called a concave lens; The lens used for hyperopia is called a convex lens.

Myopia is the ability to see clearly near and distant. Hyperopia is just the opposite, it is not clear to see the near and see the distance clearly, children with farsightedness are mostly born, and the later hyperopia is directly related to eye health, so whether it is myopia or farsightedness, the most important thing is to pay attention to eye hygiene, pay attention to diet, and do not use eyes for a long time.

The most direct way to determine whether you are nearsighted or farsighted is to refraction in the hospital, which can know exactly the specific condition of the eye and can treat it in a targeted manner.

Whether children under the age of 18 are nearsighted or farsighted, the most fundamental cause is the lack of vision nutrients. It is recommended to take Joy Vision Nutrients, take it with warm water, and insist on taking it for a period of time, and your vision will gradually be controlled or improved.

Whether it is myopia or farsightedness, if it is not treated in time, it will have a serious impact on future education and employment, so it is still necessary to pay attention to it.

Myopia lenses are concave lenses, that is, thin in the middle and thick around the periphery, and hyperopia lenses are convex lenses, thick in the middle and thin in the periphery, all in order to make the focus on the retina image.

Myopia lenses are thin in the middle.

Thick farsightedness on both sides is the opposite.

Convex lenses are made according to the principle of refraction of light. Convex lenses are thicker lenses with thinner edges. Convex lenses are divided into biconvex, plano-convex and concave and convex (or meniscus) and other forms, convex lenses have the effect of converging rays, so they are also called converging lenses, and thicker convex lenses are expected to be far away, converging and other effects.

Farsighted glasses are convex lenses.

The optical path diagram is as follows

Concave lenses are also known as negative ball lenses, and the middle of the lens is thin, the edges are thick, and they are concave, so they are also called concave lenses. Concave lenses have a divergent effect on light. Myopia eye mirrors are concave lenses.

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. (Concave lenses have two imaginary focal points).

The optical path diagram is as follows

Choice of lenses.

1. Select according to the refractive index

Because the higher the refractive index of the lens, the thinner the lens, but the higher the cost.

2. Material selection:

Glass sheet: Now the utilization rate is low, and the factory is mainly doing high refractive index, such as: refractive index.

Resin sheet: At present, it is still the most mainstream material, and the hardness is higher after surface strengthening. Not as good as glass lenses, of course.

PC Film: The maturity of the domestic lens has yet to be confirmed, but its lens is light, high toughness and no chipping are advantages.

Guidance: Farsightedness below 300 degrees is not recommended to wear glasses if it does not affect vision. Especially for children under the age of 18.

For children under the age of 18 who are farsighted, it is recommended to take two packets of Joy Vision Nutrients every day, and the changes can be seen in about a week. If you continue to take it for a period of time, the degree of farsightedness will decrease and your vision will slowly recover. And it won't**.

According to your own degree, choose the most suitable for yourself, and the material is also, depending on our daily life and the nature of the work to choose.

It is enough to choose a hospital and listen to the doctor's advice.

Yes, it is called progressive multifocal lenses.

Progressive lenses are also known as progressive lenses.

As the name suggests, there are multiple focal points on one lens. If you divide it from the focal point, you can divide the lens into single vision lens, bifocal lens, and multifocal lens.

Our most common lenses are monofocal lenses, which have only one luminosity on the lens; Bifocal lenses are bifocal lenses, which were used by many elderly people to solve the problem of seeing far and near at the same time, but due to the shortcomings of their own research and the popularity of progressive multifocal, bifocal lenses have been basically eliminated; As a milestone in the history of lens development, multifocal lenses will also be the main direction of future research and development and market popularization by scientists.

The lens of the farsighted eye is a convex lens, the middle of the lens of the convex lens is thicker than the edge, the higher the power, the more obvious, the magnifying glass in life is the convex lens, but it is a double convex lens, both sides are convex, and the lenses made into spectacle lenses are generally very convex on one side and slightly flat on the other side in order to be beautiful and lightweight.

The protruding part is on the outside, and it is basically impossible to match the reverse

Analysis: The cause of hyperopia is that the image of the eye is behind the retina. Therefore, it needs to be corrected with a convex lens.

A convex lens is a mirror that is thick on the inside and thin on the edges. So the protrusion of the farsighted glasses is in the inside.

When you wear glasses in an optical store, there is no possibility that the lenses will be reversed. Because the optical store separates the myopia lens from the farsightedness lens.

And I'll try on the glasses for you after they're fitted.