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Purpose: 1) To determine the sources of aberration in myopic eyes, by measuring in vivo the optical quality of the cornea and of the internal ocular components as a function of myopia. 2) To relate measured aberrations to physical properties of myopic eyes, using eye models. Methods: Experiments were done on 49 young eyes with spherical error ranging from-0.25 to-15 D. Total aberrations were measured with Laser Ray Tracing. The pupil was sampled sequentially and the corresponding images collected on a CCD camera. Ray aberrations were computed from the image deviations from a reference. Corneal aberrations were obtained from videokeratographic corneal elevation maps. Pupil size was 6.5 mm. Wave aberrations were described as Zernike polynomial expansions. Root Mean Square wavefront error (RMS) was used as optical quality metric. The wave aberration for the internal optics was the …