The present invention provides an optical refraction system for obtaining an optical device, which can be used in a low-cost device, system, and method that can measure refractive error very accurately by being attached to a smartphone. The device of the present invention can use the reverse Shack-Hartman technology to simulate the cross cylindrical mirror program used by the optometrist with ambient light or light source. Combining optical equipment with smartphones, the user can first change the angle of the axis until the user sees the cross pattern (equal spacing between vertical and horizontal lines)； the user can use the motorized controls on the optical device to adjust the display, In order to make the lines merge and overlap, it is equivalent to make the view clear, so as to provide the user with an accurate and suitable optical prescription.本發明提供一種用於獲得光學設備的光學折射系統，可用於低成本的設備、系統和方法，該低成本設備可以通過附接到智慧型手機來非常準確地測量屈光不正。本發明的設備可透過反向Shack-Hartman技術，用環境光或光源模擬視光師使用的交叉圓柱鏡程式。將光學設備與智慧型手機結合使用，使用者可先改變軸的角度，直到使用者看到交叉圖案（垂直和水平線等間距）為止；使用者可使用光學設備上的機動化控制項調整顯示，以使線條匯合並重疊，相當於讓視圖變得清晰，從而為使用者提供準確適合的光學處方。
