Optometry combined table convenient for adjusting height of supporting arm

The optometry combination table convenient for adjusting the height of the supporting arm comprises a bottom plate, the right side of the top of the bottom plate is fixedly connected with a fixing cylinder, the bottom of an inner cavity of the fixing cylinder is rotatably connected with a screw rod through a bearing, and the outer surface of the screw rod is in threaded connection with a sleeve. The optometry combined table comprises a base plate, a fixing cylinder, a sleeve and a lamp holder, the top of the sleeve penetrates through the fixing cylinder and is fixedly connected with a bearing plate through a connecting plate, and the left side of the top of the bearing plate is fixedly connected with a sliding column. The optometry combined table can be jointly constructed by arranging the base plate, the fixing cylinder, the bearing plate, the sliding column, the sliding cylinder, the bull eye hanging frame, the hose and the lamp holder; the supporting height of the device can be adjusted by arranging the sc