ETDRS "2000" Series charts utilize a geometric progression from line to line. Each optotype on the chart is proportionally spaced. By using these types of progression and spacing the chart becomes balanced and equal. This give the patient a well calibrated test that can be reused, relied on, and trusted.
- 4 Meter 2000 Series Revised ETDRS Chart "3"
- Precision Vision®
- 4 meters (13 ft.)