Apochromatic(APO) design. Restore true colors of the eye. The achromatic design not only corrects the chromatic aberration of red, green and blue light, but also corrects the spherical aberration of red and blue light. Thanks to the perfect correction of various aberrations, the microscope has a high resolution and better image quality. Multi-layer optical coating improves light transmission and enhances lens durability. High resolution enables high comfort during the surgery. Selected ultra-high precision optical lens groups, leading in basic processing accuracy of the lens groups in the industry. The high precision of the processing ensures the performance of the optical design. Deep depth of field reduces refocusing and improves surgery efficiency.

Red reflex brightness adjustment is independent of stereo illumination adjustment. The red reflex produced by the uniquely designed multi-directional stereoscopic coaxial illumination allows the surgeon to clearly see the boundaries of the capsule and the fine structure of the lens even in the weak light, thus easily performing capsulorhexis, stable aspiration of the residual cortex and steady polishing of the posterior capsule. The multi-directional red reflex easily overcomes problems such as insufficient illumination due to misalignment of the eye during surgery.

The main objective lens is motorized zoom system, which reduces the discomfort caused by the field of view switching and allows the surgeon to focus more on the surgery. The foot control panel is capable of controlling 14 functions of the SM621. Surgeons can easily adjust the brightness and zoom magnification, switch the filters and backup bulb etc. Without any hand movement. Magnification factor 0.4~2.4(4.3X~25.5X) Wireless foot control panel is more convenient in the OR.

The parameter Settings are clear at a glance. Touch-screen adjustment of magnification and X-Y-Z axis. Supports X-Y-Z axis fine-tuning speed, ZOOM display, and foot-controller mode as you want. Multiple filters can be chosen.

Optional 4K digital module with high-resolution digital output, high signal-to-noise ratio, high sensitivity; The digital display can be independently focused. When zooming to 2.4, the both eyes can observe the image and the digital module image simultaneously clearly, making it easier to observe the posterior pole. Enhanced Depth of Field Adjustable aperture, precise control of surgical positioning and details to meet the doctor's different requirements for brightness and depth of field.