Hi, because it features a 5MP built-in camera, and the camera captures the image directly from the objective lenses, bypassing the eyepieces when you’re using the screen. 

Hello, our microscope lens is made of high-quality optical glass. 

Hello, clean the microscope lens. We suggest that you spray a little alcohol on the lens and then wipe it with a cleaning cloth. Do not use dry towels, tissues, and other items when cleaning, as they may scratch the lenses. I hope I can help you 

Of course it can be used. But since slides are made of glass, our microscope is equipped with 8 LED lights that reflect light during use. 

Step 1: Being careful not to touch the lens, cover the right objective lens (or close your right eye) and turn the central focusing dial until the image seen by the left eye is clear. Step 2: Cover the left lens (or close the left eye) and this time instead of turning the central focusing wheel, turn the diopter adjustment ring (located near the right eyepiece and displayed on the small image in the upper right) until the image is clear. Step 3: Finally look through the binoculars with both eyes until the image is clear and sharp.