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Eyepiece: The lens the viewer looks through to see the specimen. The eyepiece usually contains a 10X or 15X power lens. Diopter Adjustment: Useful as a means to change focus on one eyepiece so as to correct for any difference in vision between your two eyes.

Explanation:

plzzzzzz give brainly cuz

Answer:

some of them help with your vision and some help with eye problems like irritated