Accommodation is the process by which the eye focuses to see near objects. A normal eye, that is to say, an eye that is neither nearsighted nor farsighted, is naturally focused to see distant objects clearly. To see close-up objects, such as when reading, the flexible lens inside the eye changes shape and becomes “rounder.” This process is called accommodation and is quite versatile when young. After the age of 40, however, our lens becomes stiff and accommodation becomes more challenging. We lose our ability to accommodate and we become more dependent on glasses and bifocals with time. This loss of accommodation is called presbyopia.
Finally, here is a rock song about accommodation: