Inclusion Criteria:  Male or female subjects between and including 18 and 50 years of age; Healthy eyes; Dominant eye with a monocular CDVA ≥1.0 decimal (≤ 0.0 logMAR) without cycloplegia; Subject who has been informed of the consequences and constraints of the protocol and who has given his/her written informed consent; Negative COVID19 screening test prior to every trial visit.  Exclusion Criteria:  Subjects of less than 18 or more than 50 years of age; Monocular CDVA of dominant eye < 1.0 decimal (> 0.0 logMAR) without cycloplegia; Subject unable to comply with the study protocol or likely to be non-cooperative during the study; Subject whose freedom is impaired by administrative or legal issues, or adult persons under legal protection or unable to give an informed consent; Pseudophakic subjects; Subjects, who are unable to fixate for a longer time, e.g. strabismus, nystagmus; Pathologic miosis; Intake of drugs affecting vision; Participation in another biomedical study in parallel, if it affects vision or if interactions with cycloplegia exist; Intolerance to or contraindication to cycloplegia, e.g. due to narrow angle of the anterior ocular chamber; Hyperopes with more than +6 D refraction.