2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6041We review all the cosmic shear results obtained so far, with a critical discussion of the present strengths and weaknesses. We discuss the future prospects and the role cosmic shear could play in a precision cosmology era.48 pages, Lecture given at the Aussois winter school, january 2003Astrophysicstext