Snellen Chart A4 Pdf Guide

| Acuity (feet) | Acuity (metric) | What it means | |---------------|----------------|----------------| | 20/20 | 6/6 | Normal distance vision | | 20/30 | 6/9 | Slightly below average; may still drive without correction in many places | | 20/40 | 6/12 | Typical cutoff for driver’s license without glasses | | 20/60 | 6/18 | Reduced vision; difficulty recognizing faces across a room | | 20/200 | 6/60 | Legally blind threshold (with best correction) |

The Snellen chart was developed in 1862 by the Dutch ophthalmologist Herman Snellen. Before its invention, there was no standardized way to measure vision. Snellen sought to create a scientific method to determine how well a person could see compared to "normal" vision. snellen chart a4 pdf