A vision measuring device includes an optical apparatus, an assistant focusing apparatus, an image capturing device, and a light source. The light source is configured to irradiate a workpiece to be tested. The optical apparatus includes a first lens, a second lens, and a partial reflector. The optical apparatus is configured to get an image of the workpiece. The image capturing device is configured to sense the image and transfer the image to electronic signals. The image capturing device is also configured to transmit the electronic signals to a computer system. The assistant focusing apparatus includes a pattern light source and a pattern slice. The partial reflector is located between the first lens and the second lens, and is not parallel with the second lens. Lights from the pattern light source pass through the pattern slice, the partial reflector, and the second lens to project to a surface of the workpiece to form a pattern of the pattern slice forms on the surface of the workpiece.一種影像測量儀,包括一光學裝置、一輔助對焦裝置、一影像攫取裝置及一光源,該光源用於照射一待測工件,該光學裝置包括一第一透鏡、一第二透鏡及一半透半反射鏡,用於對該待測工件進行光學成像,該影像攫取裝置用於感應該待測工件之像並將其轉換為電訊號以傳輸給一電腦系統進行處理,該輔助對焦裝置包括依次設置的一圖案光源及一圖案片,該半透半反射鏡位於該第一及第二透鏡之間且與該第二透鏡不平行,該圖案光源所發射之光線依次透過該圖案片、半透半反射鏡及第二透鏡投射至該待測工件之表面,以在該待測工件上形成該圖案片上的圖案。5‧‧‧光學裝置50‧‧‧長筒形殼體51‧‧‧第一透鏡52‧‧‧第二透鏡53‧‧‧半透半反射鏡60‧‧‧殼體61‧‧‧圖案光源62‧‧‧圖案片63‧‧‧同軸光源64‧‧‧倍率放大器641‧‧‧第三透鏡642‧‧‧第四透鏡8‧‧‧環形光源
