Subjects with two normal eyes.

The test that will be performed are the eye dominance, uncorrected and corrected distance visual acuity (UDVA and CDVA), (accommodation, ocular refraction (automatic refraction), spectacle refraction, axial length (optical, ultrasound), anterior segment biometry (anterior chamber depth), corneal topography (keratometry), contrast sensitivity (Pelli-Robson/ Sine Wave Contrast Test (SWCT), pupil size (gauge)), intraocular pressure, the VFQ-25 questionnaire and some demographic data (age, gender, ethnicity, eye color, highest education).

The tests that will be performed are the eye dominance, accommodation, uncorrected and spectacle corrected visual acuity (UCVA and SCVA), ocular refraction (automatic refraction), spectacle refraction, axial length (optical, ultrasound), anterior segment biometry (anterior chamber depth), corneal topography (keratometry), contrast sensitivity (Pelli-Robson/ Sine Wave Contrast Test (SWCT)), intraocular pressure, the VFQ-25 questionnaire and some demographic data (age, gender, ethnicity, eye color, highest education).

Protocol foresees in inclusion optional tests:straylight measurement (using Oculus C-Quant,pupillometry,distance-corrected intermediate and near visual acuity(DCIVA and DCNVA,crystalline lens thickness,aberrometry,ORA measurements (IOPcc,IOPG,CRF,CH parameters.These tests may be added by the individual sites depending of the availability of equipment.A number of secondary parameters can also be derived from primary parameters using calculations (e.g.crystalline lens power, estimated aniseikonia,etc) or by analysis of the raw data of computer based tests.