The ciliary muscle constricts making the lens thicker, shortening its focal length.
The pupil constricts in order to prevent strongly diverging light rays hitting the periphery of the cornea and the lens from entering the eye and creating a blurred image.
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The second most frequent question to arise when I teach about the ADA, FMLA, or other employment-type laws, is what constitutes an accommodation?
Employers of choice make accommodations, whenever possible, for employees.
According to the ADA, "an employer is required to make a reasonable accommodation to the known disability of an employee if it would not impose an 'undue hardship' on the operation of the employer's business.
The change in the shape of the lens is controlled by the ciliary muscles inside the eye.
Changes in contraction of the ciliary muscles alter the focal distance of the eye, causing nearer or farther images to come into focus on the retina; this process is known as accommodation.
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 distant object (and vice versa), comprising coordinated changes in vergence, lens shape and pupil size (accommodation).
It is dependent on cranial nerve II (afferent limb of reflex), superior centers (interneuron) and cranial nerve III (efferent limb of reflex).
A near object (for example, a computer screen) appears large in the field of vision, and the eye receives light from wide angles.
When moving focus from a distant to a near object, the eyes converge.
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