Educating patients on visual performance with presbyopic correcting intraocular lenses is crucial. Understanding the defocus curve of pre-presbyopic and emerging presbyopic crystalline lens will provide eye care provides useful information to better educate patients on visual performance expectations after cataract surgery with a presbyopic correcting intraocular lens. Our objective will be to assess the subjective range of clear vision of a pre-presbyopic and emerging presbyopic patient population utilizing a defocus curve. A comparison of the pre-presbyopic and emerging presbyopic defocus curve to all FDA-approved presbyopic intraocular lenses will be discussed in the manuscript.

Inclusion Criteria:

1. Able and willing to provide written informed consent on the IRB approved Informed Consent Form
2. 37-48 years of age
3. Phakic

Exclusion Criteria:

1. Previous cataract surgery
2. Any pathology for which, in the investigator's judgement, could reduce the subjects BCVA
3. Subjects that are unable to obtain 20/20 BCVA (i.e. amblyopia, etc.)

A population of 30-60 subjects will be selected for testing. Subjects can be male or female, ages 37-48.