The traditional means of measuring visual acuity in human eyes relies on eye charts and the patient's perceptions. With the advent of wavefront-based technologies, it is now feasible to objectively determine optical resolution. This paper proposes a technique using a resolution spoke to accurately predict visual acuity based on wavefront measurements. Resolution rings are constructed using Rayleigh's criterion for the determination of optical acuity; subsequent cross correlation of the blurred resolution spoke with the un-blurred spoke is used to estimate decentration of the PSF. After laser refractive surgery, the visual acuity of 11 eyes (formerly myopic) was estimated using this technique. The predicted visual acuity was compared to the corresponding subjective measurements using 100% contrast. The correlation variance between predicted and measured acuity was about 74%, which shows that the optical acuity of human eyes can be measured objectively.