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Visual acuity (VA) is one of the most important measures of our visual performance. Further aspects like visual field, contrast sensitivity, color vision, motion perception etc. are not covered here. There exist (too) many measures to quantify visual acuity.
Its formula is: 100 - 50 x logMAR or 100 + 50 x log (V). It is more user friendly, since it avoids decimal values and is more intuitive, since higher values indicate better vision. The score is easily calculated on ETDRS charts, where 1 point is credited for each letter read correctly.
Instructions for: Conversion Chart Refractive State to “estimated” Visual Acuity. Example 1. DS Result in minus (-), use “myopia” columns. Myopia conversions are for all ages. Conversion for this example indicates an “estimated” visual acuity of 20/60 (OD) and 20/60 (OS) Example 2. DS Result in plus (+), use “hyperopia” columns.
Purpose To assess if conversion of decimal visual acuity (VA) to logMAR is reliable for clinical and research purposes.
publishes articles from around the world, where standards for measuring visual acuity vary. This table will help readers interpret visual acuity findings in familiar units. Revised Visual...
Decimal: The visual acuity can be expressed in decimal or percentage for example 0.8 (80%), 1.0 (100%), or 1.2 (120%). In this system, 1.0 or 100% means the average vision, 2.0 or 200 % is the highest possible value and indicates very sharp, way above-average vision.
10 paź 2024 · In other countries, visual acuity is expressed using the metric system. Because 20 feet is equivalent to 6.096 meters, 20/20 vision is equal to 6/6 vision. For example, 6/12 is a metric measurement on the Snellen test. It’s equivalent to 20/40 in feet, .50 in decimal, and .30 on the LogMAR scale.
