The University of Arizona
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J. Daniel Twelker, OD, PhD


Optometrist
University Physicians Healthcare

Assistant Professor
Ophthalmology and Vision Science
UA College of Medicine
Public Health

J. Daniel Twelker, OD, PhD is Principal Investigator of the Tucson site of the Collaborative Longitudinal Evaluation of Ethnicity and Refractive Error (CLEERE). CLEERE is a multi-center, observational investigation of eye growth in schoolchildren. The purpose of the study is to compare and contrast normal eye growth, ocular component development, and refractive error development in Hispanic, African-American, Native American, Caucasian and Asian schoolchildren. In addition, the study investigates risk factors for the development of myopia and conducts DNA-based studies on nearsighted children and their families.