Normal binocular and accommodative subjects will participate in the study. All subjects have to fulfill the inclusion criteria. All evaluations will consist of the following objective and subjective optometric tests, which will be executed for all participants.  Monocular and binocular VA at near and distance with their habitual correction Refractive error measured with the Grand Seiko WAM-5500 Autorefractor Cover Test at near (40 cm) Near Point of Accommodation Near Point of Convergence Vergence Facility Test at near (40 cm) Monocular and binocular Accommodation Facility Test at near (40 cm) Negative and Positive Relative Accommodation Test (ARN and ARP) Random Dot 2 Stereo acuity Test CISS questionnaire Fusional Vergence Amplitude using both subjective and objective methods  Exclusion Criteria:  having eye surgery having an eye pathology having a binocular or an accommodative disorder using orto-K lenses