The extent to which the pupil dilates decreases with age, leading to a substantial decrease in light received at the retina. Macular degeneration is especially prevalent in the U. Changing the curvature of the lens is carried out by the ciliary muscles surrounding the lens; this process is known as "accommodation". American Journal of Epidemiology. Ciliary processes Ciliary muscle Pars plicata Pars plana. Researchers vary in their definition of Microsaccades by amplitude, Martin Rolfs  states that 'the majority of microsaccades observed in a variety of tasks have amplitudes smaller than 30 min-arc'. While there are many changes of significance in the non-diseased eye, the most functionally important changes seem to be a reduction in pupil size and the loss of accommodation or focusing capability presbyopia. For example, when the head moves to the right, the eyes move to the left. New York: Wiley-Interscience.
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