Prevalance of cataract at one point of time can be determined by -: (A) Longitudinal study, (B) Cross-sectional study, (C) Surveillance, (D) Coho study
Answer is B. Ans. is 'b' i.e., Cross-sectional study o This queston is straight forward, Prevelance is obtained by cross-sectional study and therefore cross-sectional study is also known as prevalence study.