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The eye relief of an optical instrument (such as a telescope, a microscope, or binoculars) is the distance from the last surface of an eyepiece within which the user's eye can obtain the full viewing angle. If a viewer's eye is outside this distance, a reduced field of view will be obtained.
Eye relief typically ranges from about 2 mm to 20 mm, depending on the construction of the eyepiece. Long focal-length eyepieces usually have ample eye relief, but short focal-length eyepieces are more problematic. Until recently, and still quite commonly, eyepieces of a short-focal length have had a short eye relief.
Eye relief – Eye relief is the distance from the rear eyepiece lens to the exit pupil or eye point. [15] It is the optimal distance the observer must position their eye behind the eyepiece to see a non-vignetted image. The longer the focal length of the eyepiece, the greater the eye relief.
Board certified ophthalmologist Dr. Diane Hilal-Campo says that "as long as they are not too hot or do not deliver too aggressive of a massage around the eye area, eye massaging tools like this ...
"In general, eye massagers can feel soothing on the eyes after a long workday," Dr. Tsai says. "Devices that gently massage through vibration or air compression can help with blood circulation ...
Lubricant Eye Gel Drops. Reviewers love the long-lasting relief they get when using this eye drop product, which is a pick from Brian Boxer Wachler, M.D., board-certified ophthalmologist and ...