Why can corneal glasses only be worn for two years?

Orthokeratology, as an effective measure to prevent and control adolescent myopia, has been selected by more and more adolescent myopia groups and recognized by more parents. However, compared with the fitting cost of frame glasses, the cost of orthokeratology is relatively high, and many parents are concerned about the service life of orthokeratology.

You may have heard many versions, six months, one year, two years and three years. So, how long is the service life of orthokeratology lens? In fact, we need to know what factors affect the service life of orthokeratology lenses.

Open Netease News to see more pictures.

First of all, the lens material

Orthokeratology lenses are made of breathable hard materials, but their wear-resistance, scratch-resistance, deformation-resistance and precipitation-resistance are different with different material components. Therefore, the service life of orthokeratology lenses made of different materials is different.

Second, the thickness of the lens.

The thinner the lens, the more comfortable it is to wear, and the easier it is to be damaged and broken. At the same time, it allows fewer polishing times and shorter service life. On the other hand, the lens is a little thicker, which can be polished in time after being scratched and worn, and the surface state of the lens can be restored, and the service life will be longer.

Third, the wearer's corneal condition.

Orthokeratology lens will change the geometry of the wearer's cornea after wearing it. The harder and thicker the cornea, the stronger the elasticity, the greater the "force" required for the lens to change shape, and the greater the lens loss. The shorter it can remain effective, the shorter its service life will be.

Fourth, lens care.

The care of lenses has a great influence on the service life of lenses. Some children use lenses for more than 1 year, and the surfaces and edges are still smooth, transparent and in good condition; Some children's lenses have only been used for 6 months, and they are full of sediment pollution and scratches, so they can't be used any more. Therefore, it is very important to learn to care for lenses correctly.

To sum up, the actual service life of orthokeratology lens is not a definite time; It depends on the state of the lens. That's why we have to check the lens every time we review. Once we find that the lens can no longer guarantee the safety of wearing or the effectiveness of shaping, the fitter will immediately ask the user to replace it. The normal service life of orthokeratology lens is about 1.5-2 years.

Tip: When cleaning the lens of yeast shaping mirror, you should use your fingertips, from the middle to the periphery, half and half, with even force, to avoid contact with hard objects and other items other than care products, and to avoid freezing due to heat. At the same time, avoid rubbing when taking it out of the mirror box, and use special deproteinized liquid regularly.