What ability allows one to adjust the lens strength for focusing on both near and far objects?

The ability to adjust the lens strength for focusing on both near and far objects is known as accommodation. This physiological process involves the ciliary muscles of the eye, which change the shape of the lens. When focusing on nearby objects, the ciliary muscles contract, causing the lens to become thicker and more curved, increasing its refractive power. Conversely, when focusing on distant objects, these muscles relax, allowing the lens to flatten and decrease its refractive power. This adjustment ensures that light rays are focused correctly on the retina, allowing for clear vision at varying distances.

Convergence refers to the inward movement of the eyes towards each other, which helps in focusing on close objects, rather than adjusting lens strength. Resolution pertains to the clarity or detail of an image perceived by the eye and is not related to the lens adjustment mechanism. Adaptation generally relates to the eye's adjustment to different levels of light, such as moving from a dark to a brightly lit environment, rather than adjusting focus for distance.