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Everyone's eyes have different abilities to see. The tasco exp binoculars eyepiece has a measure called eye relief which provides distance between the observers eye and the eyepiece lens. The larger the eye relief, the better the optics will be for people who wear glasses. Focusing controls are also a feature that needs to be chosen based on your eye's needs. Automated or manual focus capabilities need to match up with your eye's natural focusing capability. While there are many factors that affect binocular optics, this list gives the user the broadest set of options to consider when making a binocular optics selection. We hope you will find this information useful in your selection process.