Final answer:
Ophthalmology is the medical field that focuses on eye conditions, with the lens being critical for focusing images on the retina. Disorders of the lens can affect vision, but issues with the extraocular muscles affect eye movement rather than focusing. The correct answer is option: C. eye
Step-by-step explanation:
Ophthalmology is the branch of medicine that deals with diseases and disorders of the eye. It encompasses everything from prescribing corrective lenses to treating complex diseases that can result in vision loss. The anatomical structure of the eye is complex, including the sclera, choroid, retina, lens, pupil, iris, optic disc, optic nerve, and various blood vessels and eye muscles.
If your eyes are incapable of focusing an image on the retina, it could indicate that there is a problem with the lens of your eye. Problems with the lens can lead to conditions such as myopia, hyperopia, and astigmatism, depending on how the lens bends or refracts light.
The extraocular muscle is responsible for moving the eye and is one of six muscles that originate from the bones of the orbit and insert into the surface of the eye. They play no direct role in focusing but are critical for directional gaze.