Final answer:
The sharpness or acuteness of vision is measured by visual acuity, utilizing tools like the Snellen chart to determine how well a person can discern shapes and details at certain distances.
Step-by-step explanation:
The measurement of the acuteness or sharpness of vision is known as visual acuity. This aspect of vision is related to the sharpness of focus and is appraised using the Snellen chart among other tools. For instance, a measurement of 20/60 vision indicates that what a person with this type of vision can see at 20 feet could be seen by a person with normal vision at 60 feet away. Visual acuity illustrates the ability of the eye to discern shapes and details of objects at given distances, and it is a vital health check conducted in optometry offices.