Accommodation is an action that enables projections of both distant and near objects to be brought into clear focus on the retina through changing of diopteric power of crystalline lens. Although the exact mechanism of accommodation remains inconclusive, most authors agree that contraction of ciliary muscle plays a pivotal role.1, 2 Recently, accumulating evidence shows that the effect of ciliary muscle contraction goes beyond merely changing the curvature of the crystalline lens.3 Ciliary muscle contraction might be responsible for a transient elongation in axial length during the accommodation response.3 Contraction of ciliary smooth muscle applied an inward pulling force on the choroid and sclera adjacent to the ciliary body and cause protrusion at posterior sclera.