Precision Vision 2.5-Metre ETDRS LogMAR Chart (Chart 2 Revised)
For near-distance visual acuity testing, the Precision Vision 2.5-Metre ETDRS LogMar Chart (Chart 2 Revised) is a fantastic assessment tool. Using Sloan optotype letters, with ten different letters included, this chart is designed to test a patient's clarity of vision from a 2.5 metre distance. This revised chart design is suitable for optometrists, healthcare specialists, and vehicle licensing authorities.
What's Included?
What Is the Function of This Revised LogMAR Chart?
LogMAR test charts, also known as ETDRS charts, provide eyecare specialists with a means of assessing patients' clarity of vision and visual acuity. The test uses lines of Sloan optotype which patients will be encouraged to read out from 2.5 metre distance, testing their near-distance visual acuity.
What Does the Chart Being Revised Mean?
For the revised chart, there is a change in the difficulty score for each of the Sloan letters. These revised scores stem from the visual acuity examinations of 7420 eyes during the ETDRS study in which this specific type of logMAR chart was developed.
These revisions also involved the arrangement of the letters being changed to prevent patients from memorising and guessing the order of letters. Revised logMAR charts, including this model, are not suitable for use in studies sponsored by the American National Eye Institute.
Key Features and Benefits
- ETDRS logMAR chart with revised design
- Ideal for close-sight visual acuity testing at a 2.5 metre distance
- Suitable for use by optometrists, eye-care specialists, and vehicle licensing authorities
- Features an acuity range of 25.2 - 1.2 metres
- Revised chart design includes a change in difficulty scores and letter arrangement
- Each of the ten letters are presented at least once in each position
- Constructed to fit into specific Precision Vision illuminated cabinets
