Question

A study is designed to determine if there is a link between smoking and glaucoma. Records from past glaucoma patients of several ophthalmologists are obtained. These patients are divided into smokers and non-smokers.

a) Observational study
b) Case-control study
c) Cross-sectional study
d) Randomized controlled trial

Answer 1

The study to determine the link between smoking and glaucoma is a case-control study.

Step-by-step explanation:

The type of observational study that is being conducted to determine the link between smoking and glaucoma is a case-control study. In this study, past records of glaucoma patients are observed and divided into two groups: smokers and non-smokers. The researchers then compare the groups to see if there is an association between smoking and glaucoma.