Full Idea
Distance is not properly and immediately perceived by sight.
Gist of Idea
Distance is not directly perceived by sight
Source
George Berkeley (Three Dialogues of Hylas and Philonous [1713], I p.186)
Book Reference
Berkeley,George: 'The Principles of Human Knowledge etc.', ed/tr. Warnock,G.J. [Fontana 1962], p.186
A Reaction
Interestingly, if secondary qualities are not strictly perceptions of the object, and primary qualities are not directly perceived, then we don't seem to perceive anything at all. Perhaps we should drop the concept of 'perception'?