Agreement of Two OCT Biometers: A Pilot Study

Inclusion Criteria:

* Have healthy, clear corneas for the normal cohort;
* Have documented keratoconus for the keratoconus cohort;
* Have reported use of daily contact lens use for the contact lens cohort;
* Have documented dry eye, consisting of signs and symptoms for the dry eye cohort;
* Has had previous keratorefractive surgery for the post-refractive surgery cohort;
* Able to comprehend and sign the informed consent form.

Exclusion Criteria:

* Active ocular infection or inflammation;
* Unable to fixate due to nystagmus or other eye movement abnormality (e.g., significant strabismus);
* Any ocular disease and/or condition that, in the investigator's clinical judgment, may put the subject at significant risk, may compromise study result or may interfere significantly with the subject's participation in the study.