 Assessment included a thorough medical history and a complete eye examination. The latter will include ETDRS visual acuity at distance 4 mts, intermediate 60 cm and near 33 or 40 cm accordingly to the lens, under photopic conditions evaluated uncorrected and best-corrected as well as distance-corrected near and intermediate visual acuity, , and range of vision uncorrected and distance-corrected; the previous tests will be done per eye and both eyes visual summation. Slit-lamp exam, eye dominance, stereopsis, pupil size under photopic conditions, corneal topography and a satisfaction questionnaire will be evaluated as well. A defocus curve will be performed as follows: a phoropter and a 100 contrast ETDRS chart positioned 4 meters from the subject under photopic lighting conditions will be used. Manifest refraction will be used to designate the zero 0 baseline. To begin the testing, subjects will be defocused -5.00 D spherical correction from their best distance correction manifest refraction. The logMAR acuity at this refraction will be recorded. Minus spherical power will be decreased in 0.50 D increments i.e., -4.50 D, -4.00 D, -3.50 D, etc. with logMAR acuity recorded at each change in correction until only the best distance correction manifest refraction remains. In a further step, subjects will be defocused 2.00 D spherical correction from the best distance correction manifest refraction and the logMAR acuity will be recorded. Plus spherical power will be decreased in 0.50 D increments i.e., 1.50 D, 1.00 D, 0.50 D with logMAR acuity recorded at each change in correction until only the best distance correction manifest refraction remains. 