Which type of eye test is primarily used to determine nearsightedness or farsightedness?

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The refraction assessment is the primary test used to determine nearsightedness (myopia) or farsightedness (hyperopia). During this test, the optometrist uses a series of lenses to measure how the eyes focus light. By presenting different lenses and asking the patient which options produce clearer vision, the examiner can find the precise prescription needed for corrective lenses. This test is essential for identifying refractive errors and is commonly one of the first steps in a comprehensive eye examination.

In contrast, a slit-lamp examination is utilized for inspecting the structures of the eye, such as the cornea, lens, and retina, to detect abnormalities or diseases. A visual field test assesses the scope of a person's peripheral vision, which is unrelated to refractive errors. Lastly, a tonometer evaluation measures intraocular pressure to help diagnose conditions like glaucoma, not nearsightedness or farsightedness. Thus, the refraction assessment is specifically designed to identify how well a person sees at various distances, making it the correct choice for this question.