Yes. The binoculars have adjustable rotating eyecups. Those who wear glasses will be more comfortable viewing with the shortened eyecups, while those who do not wear glasses usually prefer the longer eyecups.  

10x42 means that the binoculars have 10x magnification (compared to the naked eye) and an objective diameter of 42mm. 10x42 are best for bird watching, hunting, concerts, sporting events etc. They have higher magnification, good light quality but are still easy to hold steady. 12x binoculars are difficult to hold steady and 10x50 binoculars allow more 8x binoculars have lower magnification, lower light and lower image quality. In our professional experience, most people prefer the 10x42. 

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.