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2. Focus (optics) - Wikipedia

   en.wikipedia.org/wiki/Focus_(optics)

   A principal focus or focal point is a special focus: For a lens , or a spherical or parabolic mirror , it is a point onto which collimated light parallel to the axis is focused. Since light can pass through a lens in either direction, a lens has two focal points – one on each side.

3. Accommodation (vertebrate eye) - Wikipedia

   en.wikipedia.org/wiki/Accommodation_(vertebrate_eye)

   Not only changing focus, but also correcting for lens aberrations that might otherwise result from the changing shape while better fitting mathematical modeling. [6] The "catenary" model of lens focus proposed by Coleman [13] demands less tension on the ligaments suspending the lens. Rather than the lens as a whole being stretched thinner for ...

4. Accommodation reflex - Wikipedia

   en.wikipedia.org/wiki/Accommodation_reflex

   Light from a single point of a distant object and light from a single point of a near object being brought to a focus. The accommodation reflex (or accommodation-convergence reflex) is a reflex action of the eye, in response to focusing on a near object, then looking at a distant object (and vice versa), comprising coordinated changes in vergence, lens shape (accommodation) and pupil size.

5. Human eye - Wikipedia

   en.wikipedia.org/wiki/Human_eye

   The lens is suspended to the ciliary body by the suspensory ligament (zonule of Zinn), made up of hundreds of fine transparent fibers which transmit muscular forces to change the shape of the lens for accommodation (focusing). The vitreous body is a clear substance composed of water and proteins, which give it a jelly-like and sticky composition.

6. Lens (vertebrate anatomy) - Wikipedia

   en.wikipedia.org/wiki/Lens_(vertebrate_anatomy)

   The lens is located towards the front part of the vertebrate eye, called the anterior segment, which includes the cornea and iris positioned in front of the lens. The lens is held in place by the suspensory ligaments (Zonule of Zinn), [1] attaching the lens at its equator to the rest of the eye [2] [3] through the ciliary body.

7. Lens - Wikipedia

   en.wikipedia.org/wiki/Lens

   A lens with one convex and one concave side is convex-concave or meniscus. Convex-concave lenses are most commonly used in corrective lenses, since the shape minimizes some aberrations. For a biconvex or plano-convex lens in a lower-index medium, a collimated beam of light passing through the lens converges to a spot (a focus) behind