In addition to his teaching responsibilities and private practice, Holladay invented the Brightness Acuity Tester, and has also developed the Holladay “IOL Consultant”, the Holladay 1, 2 and refractive IOL formulas and “Refractive Surgery Consultant” software programs, all of which are used daily by the many cataract surgeons around the world. It helps that his first degree was in electrical engineering, and he obtained a Master’s degree in Computer Science before enrolling in Medical School on his journey towards becoming an ophthalmologist.

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