The most commonly used is posterior chamber intraocular lens.
Its advantages are: the aberration caused by posterior chamber intraocular lens is small, which provides the best refractive correction for cataract surgery; Light and fixed intraocular lens can be located in the physiological position of normal lens; Stay away from cornea, avoid rubbing with iris, and reduce postoperative complications such as cornea and iris; The pupil aperture is small, and it can be dilated freely after operation, which is beneficial to observe the fundus.
The degree of intraocular lens implantation should be determined according to the patient's age, professional needs, living habits, previous wearing history and refractive status of the opposite eye.
Extended data:
Now commonly used in medical intraocular lens and its performance are as follows:
If it has affected the patient's life, surgery should be considered to replace the turbid lens with a transparent intraocular lens. With the development of technology, cataract surgery is not only a "vision" operation, but also a "refraction" operation. Choosing the right intraocular lens can meet the needs of seeing near, seeing flowers and seeing far, and help people get rid of the trouble of wearing glasses. There are mainly the following types of intraocular lenses, each with its own advantages and disadvantages. ?
1, monofocal intraocular lens. This is the most commonly used intraocular lens, which can improve myopia or hyperopia and is suitable for any crowd, but it has only a single focal length and can only provide the function of seeing far or near. If a monocular intraocular lens with telephoto function is implanted, patients can look at distant objects and wear reading glasses when doing close-up activities, such as reading or playing cards. ?
2. Diffractive multifocal intraocular lens. The advantages of this kind of intraocular lens are that it can provide good far, middle and near vision, and it does not depend on glasses for reading at close range. The disadvantages are that it is not suitable for patients with large pupils, and the visual quality may be poor, especially when looking at close range in dim environment. It is also not suitable for patients with astigmatism greater than 100 degrees, severe eye disease before operation, refractive surgery, other eye surgery at the same time, and large corneal spherical aberration. ?
3. Astigmatism monofocal intraocular lens. Its advantage is that there is no clear age limit for adult patients, it can provide hyperopia and myopia vision, and it can correct corneal astigmatism, but it takes some time to adapt. However, the disadvantage is that the astigmatism range is 50~400 degrees, which can not be completely corrected. The intraocular lens may rotate, resulting in a decrease in corrected vision, and glare or halo can be seen at the edge. ?
4. Three-in-one crystal (astigmatism+multifocal intraocular lens). This kind of intraocular lens is suitable for adult patients of all ages with astigmatism over 50 degrees. It can correct corneal astigmatism, eliminate or alleviate the problem of blurred vision caused by astigmatism, and obtain near, middle and far vision at the same time. ?
5. Local multifocal intraocular lens. As a new multifocal intraocular lens, its advantages are high postoperative satisfaction, less glare and less visual interference, but its disadvantages are not suitable for children, nor for patients with poor fundus and large corneal astigmatism. ?
6. Adjustable intraocular lens. This kind of intraocular lens is suitable for relatively young patients. Depending on the contraction function of ciliary muscle, it can clearly image objects at any distance in the retina, so it can be seen from far and near. ?
7. Trifocal intraocular lens. As a high-end functional intraocular lens, it has far, middle and near full field of vision, does not need to wear glasses, and the satisfaction of near and far vision can be as high as 100%, and the night vision is good. After running, you can read, drive and work at night, with less glare and no color difference. Suitable for presbyopia and cataract people who pursue high-quality life. The disadvantage is that it takes a period of adaptation after operation and the price is relatively expensive. ?
8. New electrodeless intraocular lens. This is the first long-depth intraocular lens that can correct cataract and presbyopia at the same time in China. It can provide high-quality vision in a certain distance, greatly reduce the probability of visual interference problems such as halo and glare after operation, especially at night, and is less dependent on glasses.
However, there are also some shortcomings. The near vision is slightly poor and needs to adapt to the process. Very few patients still have visual interference problems. At present, this kind of crystal has not been widely used in clinic, which is worth looking forward to. ?
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