Jaeger notations, Snellen M units, and distance equivalents are used to measure what aspect of vision?

Jaeger notations, Snellen M units, and distance equivalents are specifically utilized to assess near visual acuity, which pertains to the clarity or sharpness of vision when focusing on objects at close range.

Jaeger notations provide a scale to measure near vision performance, typically represented by different point sizes that correspond to various levels of near acuity. For instance, a Jaeger chart might include sizes ranging from J1 (smallest) to J10 (largest).

Snellen M units, on the other hand, measure vision performance at a particular distance, often specified in meters for near vision tasks. This system allows for standardized measurements that practitioners can use clinically to gauge a patient's near visual ability.

Distance equivalents convert near vision measurements into comparable values for distance vision, offering an understanding of how these performance levels correlate.

These tools primarily focus on evaluating how well an individual can see objects that are close to them, which is essential for tasks such as reading and other close-up work. Hence, the correct answer emphasizes the role of these notations and units in measuring near visual acuity.