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Blind Procedures

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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...

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$Subjective Refraction Test Using a Smartphone for Vision Screening$

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Comparative study on preventing avoidable blindness in China and in Nepal.

¹Advisory Center for Social Service, China Rehabilitation Research Center, China Disabled Person's Federation, Beijing 100068, China. linzhao@public.bta.net.cn

Chinese Medical Journal

|March 22, 2007

Summary

Nepal shows faster progress in preventing avoidable blindness than China, despite higher blindness rates. Further attention is needed to address China's challenges in meeting Vision 2020 goals.

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Last Updated: Jul 16, 2026

$Subjective Refraction Test Using a Smartphone for Vision Screening$

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Published on: September 16, 2025

Area of Science:

Ophthalmology
Public Health
Global Health Initiatives

Background:

The global

Purpose of the Study:

To compare the effectiveness of avoidable blindness prevention strategies in China and Nepal.
To identify challenges and successes in achieving Vision 2020 targets in both countries.

Main Methods:

A comparative analysis using literature review and field visit data.
Statistical comparison of blindness rates and cataract surgical rates (CSR) between China and Nepal.
Utilized SPSS Version 11.5 and chi-square tests for data analysis.

Main Results:

Nepal has a higher blindness rate than China (P < 0.05).
China has a significantly lower cataract surgical rate (CSR) than Nepal (P < 0.001).
Identified high surgery costs and human resource limitations as key issues in China's blindness prevention efforts.

Conclusions:

China's progress towards Vision 2020 targets is slower compared to Nepal.
Urgent interventions are required to accelerate blindness prevention in China.
Nepal serves as a model for advanced strategies in preventing avoidable blindness among developing nations.