Etheric vision is, in Theosophy, the power of sight peculiar to the etheric double. It is of considerably greater power than ordinary vision, and with its aid many of the phenomena of the physical world may be examined as may also many creatures of a non-human nature that are ordinarily just outside of the range of physical vision. It responds readily to various kinds of stimuli and activates under their influence. A.G.H.
Source: 81, 151.