Question: Why should the eyes be only half open?

Sri Chinmoy: If they are totally open, wide open, then you will be straining yourself and you will feel pressure. If they are half open, then you will be communicating both with the higher worlds and with the earth-world. So half open is always the best.

From:Sri Chinmoy,Philosophy, religion and yoga, Agni Press, 1980
Sourced from https://srichinmoylibrary.com/pry