We recommend performing subjective manual refraction using the objective wavefront parameters as a beginning point to determine whether there is a reasonable correlation between these two measures.

Automated refractors are able to “get you in the ballpark” so you can perform a manual refraction using the data from the automated refractor as a starting point, Alex Crinzi, OD, said in an ...

Manual refraction was performed when the autorefractor-measured visual acuity values were < 0.8.