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Causes of blindness and visual impairment in urban and rural areas in Beijing: the Beijing Eye Study.
Ophthalmology 2006; 113(7):1134.e1-11O

Abstract

OBJECTIVE

To evaluate the causes of visual impairment and blindness in adult Chinese in an urban and rural region of Beijing, China.

DESIGN

Population-based prevalence survey.

PARTICIPANTS

From a rural region and an urban region of Greater Beijing, 4439 of 5324 > or=40-year-old invited subjects participated in the study (response rate, 83.4%). Using the World Health Organization (WHO) standard and the United States standard, blindness was defined as best-corrected visual acuity (BCVA) in the better-seeing eye of <20/400 and of <2/20, respectively, and visual impairment was defined as best-corrected vision of <20/60 and > or =20/400, and of <20/40 and > or =2/20, respectively.

METHODS

Determination of BCVA, pneumotonometry, frequency doubling perimetry, evaluation of photographs of the fundus and lens, and clinical examination.

MAIN OUTCOME MEASURE

Causes of visual impairment and blindness.

RESULTS

Visual acuity measurements were available for 8816 eyes of 4409 subjects (99.3%). Using the WHO standard and the U.S. standard, 49 (1.1%) subjects and 95 (2.2%) subjects, respectively, had low vision, and 13 (0.3%) subjects and 15 (0.3%) subjects, respectively, were blind by definition. Taking the whole study population, the most frequent cause of low vision/blindness was cataract (36.7%/38.5%), followed by degenerative myopia (32.7%/7.7%), glaucoma (14.3%/7.7%), corneal opacity (6.1%/15.4%), and other optic nerve damage (2.0%/7.7%). Age-related macular degeneration (AMD) (2.0%/7.7%) and diabetic retinopathy (0%/7.7%) were responsible for a minority of cases. In subjects 40 to 49 years old, the most frequent cause of low vision and blindness was degenerative myopia. In the 50- to 59-year age group, the most frequent cause was cataract, followed by degenerative myopia. In the 60- to 69-year-old subjects and the > or =70-year group, the most frequent cause of low vision and blindness was cataract, followed by degenerative myopia and glaucoma.

CONCLUSIONS

The most frequent cause of low vision and blindness in adult Chinese is cataract, followed by degenerative myopia and glaucomatous optic neuropathy, with degenerative myopia dominating in younger groups and cataract dominating in elder groups. In contrast to studies in Western countries, AMD and diabetic retinopathy appear to play a minor role as a cause of visual impairment in elderly Chinese.

Authors+Show Affiliations

Department of Ophthalmology and Eye Hospital, Tongren Hospital, Beijing, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16647133

Citation

Xu, Liang, et al. "Causes of Blindness and Visual Impairment in Urban and Rural Areas in Beijing: the Beijing Eye Study." Ophthalmology, vol. 113, no. 7, 2006, pp. 1134.e1-11.
Xu L, Wang Y, Li Y, et al. Causes of blindness and visual impairment in urban and rural areas in Beijing: the Beijing Eye Study. Ophthalmology. 2006;113(7):1134.e1-11.
Xu, L., Wang, Y., Li, Y., Wang, Y., Cui, T., Li, J., & Jonas, J. B. (2006). Causes of blindness and visual impairment in urban and rural areas in Beijing: the Beijing Eye Study. Ophthalmology, 113(7), pp. 1134.e1-11.
Xu L, et al. Causes of Blindness and Visual Impairment in Urban and Rural Areas in Beijing: the Beijing Eye Study. Ophthalmology. 2006;113(7):1134.e1-11. PubMed PMID: 16647133.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Causes of blindness and visual impairment in urban and rural areas in Beijing: the Beijing Eye Study. AU - Xu,Liang, AU - Wang,Yaxing, AU - Li,Yibin, AU - Wang,Yun, AU - Cui,Tongtong, AU - Li,Jianjun, AU - Jonas,Jost B, Y1 - 2006/05/02/ PY - 2005/09/19/received PY - 2006/01/16/revised PY - 2006/01/17/accepted PY - 2006/5/2/pubmed PY - 2006/7/21/medline PY - 2006/5/2/entrez SP - 1134.e1 EP - 11 JF - Ophthalmology JO - Ophthalmology VL - 113 IS - 7 N2 - OBJECTIVE: To evaluate the causes of visual impairment and blindness in adult Chinese in an urban and rural region of Beijing, China. DESIGN: Population-based prevalence survey. PARTICIPANTS: From a rural region and an urban region of Greater Beijing, 4439 of 5324 > or=40-year-old invited subjects participated in the study (response rate, 83.4%). Using the World Health Organization (WHO) standard and the United States standard, blindness was defined as best-corrected visual acuity (BCVA) in the better-seeing eye of <20/400 and of <2/20, respectively, and visual impairment was defined as best-corrected vision of <20/60 and > or =20/400, and of <20/40 and > or =2/20, respectively. METHODS: Determination of BCVA, pneumotonometry, frequency doubling perimetry, evaluation of photographs of the fundus and lens, and clinical examination. MAIN OUTCOME MEASURE: Causes of visual impairment and blindness. RESULTS: Visual acuity measurements were available for 8816 eyes of 4409 subjects (99.3%). Using the WHO standard and the U.S. standard, 49 (1.1%) subjects and 95 (2.2%) subjects, respectively, had low vision, and 13 (0.3%) subjects and 15 (0.3%) subjects, respectively, were blind by definition. Taking the whole study population, the most frequent cause of low vision/blindness was cataract (36.7%/38.5%), followed by degenerative myopia (32.7%/7.7%), glaucoma (14.3%/7.7%), corneal opacity (6.1%/15.4%), and other optic nerve damage (2.0%/7.7%). Age-related macular degeneration (AMD) (2.0%/7.7%) and diabetic retinopathy (0%/7.7%) were responsible for a minority of cases. In subjects 40 to 49 years old, the most frequent cause of low vision and blindness was degenerative myopia. In the 50- to 59-year age group, the most frequent cause was cataract, followed by degenerative myopia. In the 60- to 69-year-old subjects and the > or =70-year group, the most frequent cause of low vision and blindness was cataract, followed by degenerative myopia and glaucoma. CONCLUSIONS: The most frequent cause of low vision and blindness in adult Chinese is cataract, followed by degenerative myopia and glaucomatous optic neuropathy, with degenerative myopia dominating in younger groups and cataract dominating in elder groups. In contrast to studies in Western countries, AMD and diabetic retinopathy appear to play a minor role as a cause of visual impairment in elderly Chinese. SN - 1549-4713 UR - https://www.unboundmedicine.com/medline/citation/16647133/Causes_of_blindness_and_visual_impairment_in_urban_and_rural_areas_in_Beijing:_the_Beijing_Eye_Study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0161-6420(06)00114-X DB - PRIME DP - Unbound Medicine ER -