Expected Refractive Error in Eye Care
Visual Norms and Expected Values
Expected Refractive Error Description
In optometric diagnostics, understanding the range of expected refractive errors is crucial for setting benchmarks against which patient data can be evaluated. Expected refractive errors vary widely among individuals but generally fall within a range that is considered normal for various age groups and visual demands. By establishing a clear understanding of these expected norms, optometrists can better identify when a refractive error is within a normal range or when it may necessitate corrective measures, such as glasses or contact lenses.
VA | Absolute Myopia/Hyperopia | Uncorrected Astigmatism |
---|---|---|
20/20 | 0.00 | Small |
20/30 | 0.50 | 1.00 |
20/40 | 0.75 | 1.50 |
20/60 | 1.00 | 2.00 |
20/80 | 1.50 | 3.00 |
20/120 | 2.00 | 4.00 |
20/200 | 2.00-3.00 | High |