The purpose of double blinding in clinical trails is to-
There may be bias in randomized control trials. Randomization cannot guard against these so of bias, nor the size of the sample. In order to reduce these problems, a technique known as blinding is adopted. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 91
Achieve comparability between study and control groups
Avoid observer bias
Avoid subject bias
Avoid observer and subject bias
Epidemiology