Inclusion Criteria:  age-related cataract and scheduled for cataract surgery age 21 or older written informed consent prior to surgery  Exclusion Criteria:  dense cataract or corneal pathology that would significantly influence the measurements previous ocular surgery, ocular inflammation, or ocular trauma nystagmus or pathologies that might affect patient's fixation pregnancy corneal astigmatism > 1.5 dpt. or need for a toric IOL