An Essay Towards a New Theory of Vision

Berkeley opens his treatise by questioning the familiar explanations of how we gauge distance and size with our eyes. He argues that the familiar geometry of lines and angles, long trusted by optics, cannot alone account for the way we actually experience space. Instead, he points to the mind’s role, suggesting that distance is inferred through past experience, the turn of the eyes, and the way visual impressions mingle with other sensations.

The essay proceeds to examine puzzling phenomena—such as why a distant moon appears larger near the horizon or how a person newly given sight might misjudge size and depth. By challenging accepted principles, Berkeley invites listeners to reconsider vision as an active, interpretive process rather than a passive reception of fixed measurements. This early philosophical exploration offers a fresh lens on perception, blending careful observation with thoughtful argument.