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Intraocular lens implantation is the most effective treatment of cataract and intraocular lens implantation in China has a history of 30 years, with the continuous progress of medical technology, artificial crystal is continually updated, there are many types of artificial crystal currently available, can satisfy the different patient's condition and economic conditions demand. Dr. Song Hui, director of the Department of Ophthalmology of the eye hospital of the city, suggested that the patient should choose the appropriate crystal according to the individual's condition, not necessarily expensive, and the key is to be suitable.

At present many kinds of artificial crystal, have to adapt to the crowd. Artificial crystal is the most common hard and soft (folding push type) crystal. Rigid artificial lens used in clinical for a long time, its clinical effect has been fully verified, cheap, but the incision is larger when implanted, generally in about 6 mm. The risk of infection, postoperative astigmatism will be larger. Soft IOL is characterized by folding, so the incision is small, usually in 2 to 3 millimeters, without suture, postoperative visual recovery is fast. With the progress of science and technology and the improvement of people's visual quality after cataract surgery, aspheric intraocular lenses have appeared on the basis of traditional spherical artificial lenses. The traditional spherical intraocular lens convex lens surface curvature radius of curvature of each point are equal, will affect the image quality, especially in the state of night eye pupil; aspheric intraocular lens of aspherical design on the surface of peripheral anterior or posterior intraocular lens imaging department, more sharp, see more clearly, especially at night. Aspheric intraocular lens compared with spherical intraocular lens is more expensive.

In addition, the artificial crystal is divided into and the adjustable artificial crystal, single focus intraocular lens. Most of the intraocular lenses currently used are single focus intraocular lenses, which have only one focal point, and the intraocular lenses implanted with this intraocular lens can only see objects at a distance. Therefore, after the operation still need to wear glasses or glasses to see far or near to meet the needs of. In recent years, adjustable intraocular lenses and bifocal and three focus intraocular lenses have been developed, with the aim of achieving adjustable visual acuity throughout the whole process and reducing the dependence on glasses. Adjustable intraocular lens (IOL), the biggest deficiency is the poor regulation ability, the limited range of accommodation, long-term with the capsular bag fibrosis will affect the effect. Bifocal intraocular lenses (IOL) make two focal points on an artificial lens, one for viewing the distance and one for looking at the distance. In principle, the two focus, when one of them is used, the other must be out of focus, which requires the patient to adapt. Three intraocular lens is the latest international artificial crystal. Last year, China's first Cai Sisan focus intraocular lens implantation. Three focus intraocular lens has three focal points, far, middle and near, which can realize the whole visual acuity and reduce the wearing mirror after operation. Three intraocular lens is particularly suitable for close work (reading, computer) patients, such as patients with their own eyes good conditions, after playing computer, reading the newspaper, 90% no longer wear presbyopic glasses, and the effect of bilateral implantation of more. But the eyes of intraocular lens on the patient's own condition requires high frequent night work, night driving habits, astigmatism >0.75D and opacity of refractive media, with obvious corneal or retinopathy, small pupil fundus were not for.

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