What is the meaning of "focusing ability" for eyes.?

Question

what is the meaning of "focusing ability" for eyes.

my native language is not English.

And are there any exercises can improve the focusing ability of eyes.

Answer 1

How much the eyes can adjust to allow a visual stimuli to be seen with the greatest clarity.

Exercises- NO

Answer 2

The focusing ability of the eyes depends on your cillary muscle and cornea's... In the lack of a better word, strength. It is how much the eye can focus light and bring it closer to the retina. As for the excersices, that topic is controversial. The Bates method claims that you can improve your visual acuity with a set of simple excercises (used to strengthen the cillary muscle) although it is largely rejected by the scientific community. Look it up if you want to learn more.