[Prevalence and surgery status of cataract among adults aged 50 years or above in the Shunyi district of Beijing: the China Nine-Province Survey].

Objective: To assess the prevalence of cataract, the outcomes of cataract surgery, the rate of cataract surgical coverage, and the rate of cataract blindness social burden.

Methods: Cluster sampling was used in 5118 randomly selected individuals aged > or = 50 years in the Shunyi district of Beijing from April to August 2006. All individuals were received visual acuity and eye examination, including the evaluation of lens status and cataract surgical status by slit lamp biomicroscopy.

[Prevalence of blindness and moderate and severe visual impairment among adults aged 50 years or above in the Shunyi District of Beijing: the China Nine-Province Survey].

Unlabelled: OBJECTIVE To assess the prevalence of blindness and moderate and severe visual impairment among adults aged 50 years or above in the Shunyi district of Beijing,China.

Methods: It was a population-based cross-section study. Geographically defined cluster sampling was used in 5840 randomly selected individuals aged > or = 50 years in 28 clusters in the Shunyi district from April to August 2006.

[Detecting appositional angle closure by photopic and scotopic ultrasound biomicroscopy].

Objective: To evaluate the prevalence of appositional angle closure in eyes with a shallow peripheral anterior chamber (AC) and the anatomic narrow chamber angle by photopic and scotopic ultrasonic biomicroscopy (UBM).

Methods: Prospective case series study. 379 eyes of 194 consecutive patients with the shallow peripheral AC and the anatomic narrow chamber angle, which was determined by Van Herick technique and gonioscopy, were collected from the clinic and an epidemiological study.