As one of the most commonly performed operations， cataract surgery is generally successful in the majority of patients， but the great diversity in cataracts and patients means that not all surgeries present the same level of complexity. The complication rate is likely to increase with the complexity of the case， such as hard and mature nuclei， subluxated lenses， small pupil， high myopia， glaucoma and other diseases causing changes in ocular structres. It is better to understand correctly the characteristics of various types of the complicated cataract and take the appropriate surgical approach as much as possible to reduce the complications.
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