Dataset Information

Prevalence of visual impairment and outcomes of cataract surgery in Chaonan, South China.

ABSTRACT:

Purpose

To estimate the prevalence and causes of blindness and visual impairment (VI), and report the outcomes of cataract surgery in Chaonan Region, Guangdong Province, southern China.

Design

Cross-sectional population-based survey.

Participants

A total of 3484 participants including 1397 men (40.1%) and 2087 women (59.9%) aged ?50 years were examined (94.2% response rate).

Method

A two-stage cluster sampling procedure was used to select 3700 participants aged ?50 years from 74 clusters of Chaonan Region. Participants were examined according to the Rapid Assessment of Avoidable Blindness (RAAB) method. Blindness and visual impairment (VI) were defined by the World Health Organization criteria. Participants with visual acuity (VA) < 6/18 in either eye were examined by ophthalmologists. The primary causes of blindness and VI were reported with reference to the participant's better eye.

Main outcome measures

Prevalence and main causes of blindness, severe visual impairment (SVI), VI and the outcomes of cataract surgery.

Results

The standardized prevalence rates of blindness, SVI, and VI were 2.4% (95% confidence interval [CI], 1.9-2.9%), 1.0% (95% CI, 0.7-1.4%), and 6.4% (95% CI, 5.6%- 7.1%), respectively. The principal cause of blindness and SVI was cataract, accounting for 67.1% and 67.6% respectively, and the principal cause of VI was refractive error (46.9%). One hundred and fifty five out of 3484 (4.4%) people (211 eyes) had cataract surgery. Of the 211 eyes that had cataract surgery, 96.7% were pseudophakic. 67.2% of the 211 operated eyes had a presenting visual acuity (PVA) of 6/18 or better.

Conclusions

The prevalence of blindness, SVI, and VI was high among rural residents in Chaonan. Cataract remained the leading cause of avoidable blindness. Outcomes of cataract surgery performed in rural private clinics were suboptimal. Quality-control initiatives such as hands-on training program should be introduced to improve cataract surgery outcomes.

SUBMITTER: Zhang X

PROVIDER: S-EPMC5552304 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Prevalence of visual impairment and outcomes of cataract surgery in Chaonan, South China.

Zhang Xiujuan X Li Emmy Y EY Leung Christopher Kai-Shun CK Musch David C DC Tang Xin X Zheng Chongren C He Mingguang M Chang David F DF Lam Dennis Shun-Chiu DS

PloS one 20170810 8

<h4>Purpose</h4>To estimate the prevalence and causes of blindness and visual impairment (VI), and report the outcomes of cataract surgery in Chaonan Region, Guangdong Province, southern China.<h4>Design</h4>Cross-sectional population-based survey.<h4>Participants</h4>A total of 3484 participants including 1397 men (40.1%) and 2087 women (59.9%) aged ≥50 years were examined (94.2% response rate).<h4>Method</h4>A two-stage cluster sampling procedure was used to select 3700 participants aged ≥50 y ...[more]

PMID: 28797099

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Project description:We conducted a retrospective comparative-effectiveness study of best-corrected visual acuity (BCVA) and refractive error (RE) after immediate sequential (ISBCS) and delayed sequential (DSBCS) bilateral cataract surgery. We tested 2 hypotheses: (1) among DSBCS patients, second-eye outcomes were no different than first-eye outcomes; (2) averaged between each patient's 2 eyes, outcomes did not differ between ISBCS and DSBCS patients.Retrospective comparative-effectiveness study.Kaiser Permanente Northern California members who underwent noncomplex bilateral cataract surgery from January 1, 2013, through June 30, 2015.We performed an intention-to-treat analysis comparing ISBCS to DSBCS using conditional logistic regression analysis, accounting for surgeon and patient-level factors.BCVA, RE.The analysis of visual outcomes included both eyes of 13?711 DSBCS and 3561 ISBCS patients. Because of the large sample size, some statistical differences lacked clinical significance. Ocular comorbidities were slightly more prevalent in DSBCS patients. Postoperative BCVA was 20/20 or better in 48% of DSBCS first eyes, 49% of DSBCS second eyes, 53% of ISBCS right eyes, and 51% of ISBCS left eyes. The within-person difference in postoperative BCVA averaged zero (0.00) between the first and second DSBCS eyes, and between the ISBCS right and left eyes. After adjustment, average postoperative BCVA was better in ISBCS patients, although the difference was not statistically significant (compared with 20/20 or better: odds ratio for worse than 20/20 was 0.91, 95% confidence interval 0.83-1.01). Emmetropia (spherical equivalent -0.5 to 0 diopter) was achieved in 61% of first DSBCS eyes, 61% of second DSBCS eyes, 63% of ISBCS right eyes, and 63% of ISBCS left eyes. After adjustment, average postoperative RE was no different in ISBCS compared with DSBCS patients (compared with emmetropia: odds ratio for ametropia was 1.02, confidence interval 0.92-1.12). We confirmed 1 case of postoperative endophthalmitis in 10?494 ISBCS eyes (1.0 per 10?000 eyes) and 2 cases in 38?736 DSBCS eyes (0.5 per 10?000 eyes) (P = 0.6), and no patient had bilateral endophthalmitis.Compared with DSBCS, we found no evidence that ISBCS was associated with worse postoperative BCVA or RE, or with an increased complication risk.

Dataset Information

Prevalence of visual impairment and outcomes of cataract surgery in Chaonan, South China.

Purpose

Design

Participants

Method

Main outcome measures

Results

Conclusions

Publications

Prevalence of visual impairment and outcomes of cataract surgery in Chaonan, South China.

Similar Datasets

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