What term describes the clarity and sharpness of thought or vision?

The term that describes the clarity and sharpness of thought or vision is "acuity." Acuity refers to the ability to perceive or think clearly and sharply. In the context of vision, it often relates to the sharpness of visual perception, such as how well a person can see fine details. When considering mental acuity, it encompasses one's cognitive clarity and how well one can understand complex concepts or situations.

While focus pertains to concentrating attention on a particular task or subject, it does not inherently imply the clarity of thought itself, which is specifically covered by acuity. Insight involves having a deep understanding of a specific issue, going beyond mere clarity to encompass a level of wisdom or intuition, whereas awareness refers to the general state of being conscious or cognizant of something but does not directly signify sharpness. Therefore, acuity is the most precise term that captures both the clarity and sharpness of thought or vision.