Impact Evaluation: A Case Control Study in Andhra Pradesh, India
University of Michigan
To evaluate the impact of wearing reading glasses in increasing work-related productivity among the population living with Presbyopia
To evaluate the impact of wearing reading glasses in increasing monthly income among the population living with Presbyopia
Customer and comparison group matched for age, income, livelihood, and village type
Customers: defined as those who attended a VisionSpring eye camp, had Presbyopia and chose to buy reading glasses
Controls: defined as those who attended a VisionSpring eye camp, had Presbyopia, and chose not to buy reading glasses
Total sample distributed across four districts of varying socioeconomic status in AP
Exit interview of respondents (case and control) as per availability and comfort of respondent recruited at the eye camp site
Oral informed consent
Interview using structured questionnaire
Matched sample Size
261 customers (variable group)
205 comparison group members (control group)
Those wearing reading glasses reported significantly higher monthly income growth (20%) as compared to those not wearing reading glasses.
Those wearing reading glasses reported significantly higher productivity (34%) as compared to those not wearing reading glasses.