A tertiary level hospital-based case control study on frequency of changing presbyopic glasses among primary open angle glaucoma cases was carried out jointly by the departments of community medicine and ophthalmology from 1st July to 31st December, 2008. Each of the case and control groups included 31 persons. Odd's ratio of 4.55 (95% CI = 1.37-15.68) using epi-info version 3.2 showed that among primary open angle glaucoma cases the time of changing spectacles at < or = 2 years was 4.55 times more than that among control group; Pearson's Chi-square test (chi2 = 7.94, df = 1, p = 0.00) was statistically significant; Z-test for proportion = 2.56, p=0.01. So changing spectacles at < or = 2 years among patients would help the paramedical workers/paramedical ophthalmic assistants in the community to refer the patients earlier to ophthalmologists for further investigation and management.
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