Liang et al., 2022 - Google Patents
Prevalence of visual impairment among students before and during the COVID-19 pandemic, findings from 1,057,061 individuals in Guangzhou, southern ChinaLiang et al., 2022
View HTML- Document ID
- 2349883251088807040
- Author
- Liang J
- Chen Y
- Zhao Y
- Kakaer A
- Jiang N
- Huang S
- Zhang S
- Chen Y
- Publication year
- Publication venue
- Frontiers in Pediatrics
External Links
Snippet
Background Visual impairment (VI) is a growing public health concern among students as a result of the COVID-19 pandemic. Objective This study investigated the change in VI before and during the pandemic among students. Methods Data on 547,864 and 497,371 students …
- 201000004569 blindness 0 title abstract description 138
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
- A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by the preceding groups
- G01N33/48—Investigating or analysing materials by specific methods not covered by the preceding groups biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
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