What chart is commonly used for a clinical eye examination?

The Snellen chart is commonly used for clinical eye examinations to assess visual acuity. It consists of letters of varying sizes arranged in rows, with the largest letters at the top and progressively smaller letters down the chart. Patients are asked to read aloud the smallest line of letters they can see clearly from a specified distance, typically 20 feet. This chart is widely recognized and used in various medical settings, making it an established tool for evaluating vision.

While other charts like the LogMAR chart, Tumbling E chart, and Landolt C chart also serve specific purposes in measuring visual acuity, they are often used in particular contexts or populations. For instance, the LogMAR chart is primarily utilized in research settings due to its standardized accuracy in measuring visual acuity. The Tumbling E chart is designed for patients who may not be able to read letters, such as young children or those with language barriers, as it uses the letter "E" in various orientations that the patient must identify. The Landolt C chart uses a C-shaped figure that can be rotated, which is also helpful for specific assessment needs.

The prominence of the Snellen chart in routine eye exams underscores its importance in clinical practice and its widespread acceptance in eye care.