P1: FOUR TYPES OF VISUAL ACUITY

Minimum Visible Acuity

Also known as Detection Acuity or Minimum Detectable Acuity

Minimum Visible Acuity

Refers to the smallest object or detail that the human eye can detect - Detection of a feature

Minimum Visible Acuity

Estimates the minimum size visible

Minimum Visible Acuity

Ex. Catford Drum Test, Candy Bead Test

Minimum Resolvable Acuity

Also known as Resolution Acuity

Minimum Resolvable Acuity

Refers to the ability of the visual system to distinguish between two closely spaced objects or the finest detail within an object - Resolution of two features

Minimum Resolvable Acuity

Ex. Landolt C, Teller Acuity Charts, Tumbling E

Minimum Recognizable Acuity

Also known as Recognition Acuity

Minimum Recognizable Acuity

Refers to the ability to identify or recognize a specific feature, like a letter, symbol, or picture - Identification of a feature

Minimum Recognizable Acuity

Ex. Snellen Chart, LogMAR Chart, Lea Symbol

Minimum Discriminable Acuity

Also known as Localization Acuity

Minimum Discriminable Acuity

Refers to the smallest change in a visual feature (like size, position, or orientation) that a person can detect

Minimum Discriminable Acuity

Ex. Vernier Acuity or Hyperacuity Test