Fish and amphibians vary the power by changing the distance between a rigid lens and the retina with muscles.This dramatic change in focal power of the eye of approximately 15 dioptres (the reciprocal of focal length in metres) occurs as a consequence of a reduction in zonular tension induced by ciliary muscle contraction.When we are younger, the natural lens is very flexible and easily moves back and forth within the eye as we change our visual focus from up close to distance objects.As we age however, most commonly in our early to mid 40s, the eye loses its flexibility and can no longer easily accommodate those changes in our focus.


Accommodation is made possible by the lens inside the eye and the circular muscle that surrounds the lens, called the ciliary muscle.Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies.In this, distances vary for individuals from the far point—the maximum distance from the eye for which a clear image of an object can be seen, to the near point—the minimum distance for a clear image.With an accommodating chaperon who knew no German, the couple could do and say what they pleased.We went to a sort of inn kept by an accommodating native who promised to get up a good dinner for us.Although they might still prefer to wear glasses for prolonged reading, the vast majority of accommodating IOL patients experience freedom from glasses for tasks such as driving, watching TV, using their cell phone and computer, looking at photos, reading magazines, price tags, product labels, receipts, and menus.

You must have an account to comment. Please register or login here!