noun. 1. an amount that is contributed, taken away, or otherwise altered to elevate the correctness of a measure. 2. with regard to optometry, the correction of optical flaws that are a result of refractive mistakes via the utilization of lenses.
noun. 1. an amount that is contributed, taken away, or otherwise altered to elevate the correctness of a measure. 2. with regard to optometry, the correction of optical flaws that are a result of refractive mistakes via the utilization of lenses.