What Is a 24-2 Visual Field Test
The name “24-2” comes from the visual field area and pattern spacing it covers. The “24” means the test covers the central 24 degrees of your vision...
24-2c Visual Field
Deep research and expert guides on maintaining your visual health.
24-2C visual field
A 24-2C visual field is a version of the 24-2 field exam that adds extra test points in the central area of vision to improve detection of small central defects. Like the standard 24-2, you look at a fixation point and respond when you see lights, but the 24-2C includes additional stimuli clustered within the central 10 degrees. Those extra points help reveal subtle pieces of vision loss that might be missed by the regular grid but are not sampled by broader tests. The test is performed one eye at a time and produces a map that highlights areas of reduced sensitivity. This version matters because some eye diseases, especially early glaucoma or conditions affecting the macula and optic nerve, can cause small central or paracentral blind spots. Detecting these early allows doctors to adjust treatment sooner and protect central vision, which is crucial for reading and recognizing faces. The 24-2C strikes a balance by covering a wide field while giving extra detail where vision is most important for daily tasks. Clinicians often compare 24-2C results over time to decide whether vision is stable or worsening and whether treatment changes are needed. When used together with other exams, the 24-2C helps form a clearer picture of a person's visual health and risks.