The invention includes an off-axis paraboloid mirror, a point light source part and a light shielding part.The off-axis paraboloid mirror has a reflecting surface and an opening.The shading part is located between the point light source part and the reflecting surface,The point light source part emits a first light to the shading part,After passing through the shading part, the first light becomes a second light with a long slit section,And irradiate to the reflecting surface；The second light is reflected by the reflecting surface to become a third light,And irradiate the eyes of one subject,When the third light hits the subject's eyes, it becomes a fourth light,After the fourth light was directed at the retina of the subject's eye,Reflected as a fifth light,After the fifth light reflects the subject's eyes,It becomes the sixth light and hits the reflecting surface,The sixth light goes through the opening and becomes a seventh light,For the eyes of an optometrist.This method has the advantages of wide spectrum range, good image quality and high measurement accuracy.本創作係包括一離軸拋物面鏡、一點光源部及一遮光部。離軸拋物面鏡具有一反射表面及一開口。遮光部介於點光源部與反射表面之間，點光源部朝遮光部發出一第一光線，第一光線經遮光部後變成一斷面為長條形狹縫狀之第二光線，並照射至反射表面；第二光線經反射表面反射變成一第三光線，並照射至一受測者之眼睛，第三光線照射至受測者之眼睛後變成一第四光線，第四光線再朝受測者之眼睛的視網膜照射後，反射成一第五光線，第五光線反射出受測者之眼睛後，變成第六光線並朝反射表面照射，第六光線穿過開口變成一第七光線，供一驗光師之眼睛觀察。本案兼具可適用之光譜範圍較大，及成像像質好而可提高量測準確度等優點。
