What is a numerical value associated with the smallest objects a patient can see at a specific distance called?

The term that refers to the numerical value associated with the smallest objects a patient can see at a specific distance is known as visual acuity. Visual acuity is a crucial measure in ophthalmology, as it assesses the clarity or sharpness of vision. It is typically expressed in a fraction, such as 20/20, where the top number indicates the distance (in feet) from which a person can see an object, and the bottom number denotes the distance at which a person with normal vision can see the same object. This measure helps eye care professionals determine the functionality of a patient's vision and the need for corrective lenses or further medical intervention.

Visual field refers to the entire area that can be seen when the eyes are fixed in one position, which does not specifically quantify how small objects can be perceived. Visual contrast relates to the ability to distinguish between objects of different luminance or color, while visual clarity is more of a qualitative description of the sharpness of vision rather than a quantifiable measurement.