The ability of the eye to focus on objects at various distances is known as

Step 1: Analyze the question The question asks for the term describing the eye's ability to focus on objects at different distances, near or far.

Step 2: Explain the concept The eye focuses by changing the focal length of its lens. The ciliary muscles contract or relax to change the lens's curvature:

• Near objects: the ciliary muscles contract, the lens becomes thicker (more curved), and the focal length decreases.
• Distant objects: the ciliary muscles relax, the lens becomes thinner (flatter), and the focal length increases.

This adjustment is called accommodation.

Step 3: Check each option

• A. Accommodation: the eye's ability to adjust its focus for different distances. ✔
• B. Astigmatism: a defect caused by an uneven curvature of the cornea or lens, so light does not focus at a single point.
• C. Eye ring: not a standard term for focusing.
• D. Myopia: short-sightedness. Distant objects look blurred because the image forms in front of the retina.
• E. Presbyopia: the loss of accommodation with age, as the lens becomes less flexible. This is a defect, not the ability itself.

Step 4: Answer The correct option is A. accommodation.

Exam tip: Remember that accommodation = adjustment. Terms ending in "-opia" (myopia, presbyopia, hypermetropia) usually describe eye defects, while accommodation describes the eye's normal function.