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The physical distance between the distal end (front element) of a lens or optical system (such as a microscope objective or a direct ophthalmoscope) and the surface of the specimen or the patient's eye being examined.
read more about working distance ...In microscopy, a longer working distance allows for easier manipulation of the specimen, but generally results in lower magnification and a smaller numerical aperture.
For indirect ophthalmoscopy or slit lamp examination, the working distance is the gap between the instrument's objective lens and the patient's eye, which must be correctly maintained for a clear image.
Refers to the specified distance from the eye plane where visual tasks (e.g., reading, computer work) are performed, which influences the required accommodative and vergence demand.
A longer working distance provides more space for instruments, lighting, and surgical tools to operate without colliding with the objective lens.
The focal length is the distance from the optical center of the lens to the focal point; it is related to, but not the same as, the working distance.
Yes. In objective lenses, as the magnification (power) increases, the working distance inevitably becomes shorter.