Method of fitting contact lenses

A contact lens fitting method, comprising the steps of:

• a.) obtaining baseline measurements of low order aberration data;
• low order manifest subjective data;
• high order spherical aberrations resulting from the crystalline lens;
• corneal data;
• and visual requirements or an individual;
• b.) determining a difference between the lower order aberrations and the lower order manifest subjective refraction obtained in carrying out the baseline measurements in step a.);
• c.) fitting at least a first trial aspheric lens on an eye of the individual, wherein the first trial lens is selected based on the low order aberrations and the crystalline lens spherical aberrations less a corneal Qv;
• d.) carrying out a contrast sensitivity function measurement of the first trial lens;
• e.) obtaining a second contrast sensitivity function measurement that takes into account the difference between the low order aberration data and the low order manifest subjective data;
• f.) calculating the difference between the first and second contrast sensitivity function measurements;
• and g.) selecting an aspheric lens for the individual based on the following equation:
• (low order manifest subjective refraction+crystalline lens spherical aberrations)—
• Qv+CSA
• wherein CSA is a cortical spherical aberration and using the selection to prescribe contact lenses that correct a patient's vision during wear.