About Our Practice
Chicago Eye Institute was established more than four decades ago to deliver comprehensive eye care to our patients. It is our goal to individualize treatment for each patient and spend the time necessary to ensure they understand their disease and treatment options.
Osvaldo Lopez MD
Dr. Osvaldo I. Lopez is a graduate of Northwestern University where he earned both the Bachelor of Science and M.D. degrees. Following medical school he completed an internship at Northwestern’s Passavant Memorial Hospital. He then completed his specialty residency training in ophthalmology at Michael Reese Hospital and Medical Center where he also served as Chief Resident. Dr. Lopez pursued further specialty training, concentrating in diseases of the cornea at the renowned Texas Institute of Ophthalmology at Baylor University.
Dr. Lopez’s distinguished career as one of the nation’s leading corneal surgeons has seen him called upon to share his vast expertise through teaching and visiting professorships around the world. He is also known as an innovator, pioneering new surgical techniques and designing numerous devices used for eye surgery. Dr. Lopez remains at the forefront of corneal surgery as attested to by the fact that he was among the very first in Chicago to perform IntraLase LASIK surgery and is among the leaders nationally in the treatment of keratoconus through the use of corneal implants. Dr. Lopez’s extraordinary achievements as a physician and surgeon were formally recognized by the State of Illinois, which awarded him their highest honor, the Lincoln Medal for Medicine.
Dr. Lopez’s great efforts on behalf of humanitarian causes have been acknowledged by numerous nations and international organizations. He continues to this day to work tirelessly as hands on participant and organizer of medical missions to underdeveloped and impoverished countries throughout the world. Dr. Lopez served as a member of President Clinton’s Health Care Advisory Committee and served as an advisor on health policy to the Hispanic Caucus of the Congress of the United States. Dr. Lopez is on the faculty of the University of Illinois Medical School. He is a Diplomat of the American Board of Ophthalmology and a Fellow of the American Academy of Ophthalmology. Dr. Lopez has served for more than two decades as Chairman of the Department of Ophthalmology of the Advocate Illinois Masonic Medical Center and is the senior founding partner of the Chicago Eye Institute.
Andrew Lewicky MD
Dr. Andrew O. Lewicky attended Oberlin College and received the Bachelor of Science and M.D. degrees from Northwestern University. Following medical school, Dr. Lewicky completed internship and specialty residency training in ophthalmology at Rush Presbyterian St. Luke’s Medical Center and the University of Illinois Eye and Ear Infirmary where he served as Senior Resident. After this training Dr. Lewicky served for two years in the U.S. Navy Medical Corps, holding the rank of Lt. Commander.
Dr. Lewicky is an acknowledged expert and innovator in the field of surgery of the anterior segment of the eye. He has authored numerous articles and book chapters in the medical literature. As a visiting professor, he has presented lectures and performed surgery in many countries around the world. Dr. Lewicky’s trips are both educational and humanitarian as illustrated by his participation in Orbis, an international philanthropic organization. Orbis flies its DC-10 airliner fully equipped for eye surgery around the world fulfilling its mission of educating local ophthalmologists in state of the art eye surgery and helping to restore vision to their patients. Dr. Lewicky’s commitment to teaching also includes yearly participation as a Course Director for the American Academy of Ophthalmology and the Joint Commission on AHPO at their annual conferences. In addition, Dr. Lewicky developed and patented a micro surgical instrument known as the Anterior Chamber Maintainer, which is widely used throughout the world.
Dr. Lewicky is an early pioneer in refractive surgery, performing one of the first radial keratotomy procedures in this area in 1981. He received his initial training in refractive surgery at the Institute of Eye Microsurgery in Moscow from the acknowledged founder of modern refractive surgery Professor S. Fyodorov. Dr. Lewicky is a Diplomate of the American Board of Ophthalmology, a Fellow of the American Academy of Ophthalmology and a Fellow of the prestigious American College of Surgeons. Dr. Lewicky is an Assistant Professor of Ophthalmology at Rush University Medical School. Dr. Lewicky is a founding partner of the Chicago Eye Institute and a selected honored member of the National Directory of Who’s Who.
Michael S. Korey MD
Michael S. Korey, M.D. attended the University of Illinois at Urbana/Champaign from which he graduated with Phi Beta Kappa distinction, receiving Bachelor of Science degree. He received the M.D. degree from the University of Illinois at Chicago where he was selected as a member of Alpha Omega Alpha National Medical Honor Society. Following medical school, he completed an internship and specialty residency training in ophthalmology at the Michael Reese Hospital and Medical Center where he served as Chief Resident in Ophthalmology. Dr. Korey then pursued further sub specialty training, concentrating in the treatment of glaucoma, at the internationally renowned Barnes Eye Hospital of Washington University in St. Louis, Missouri.
Dr. Korey has authored numerous professional articles in his field and as an acknowledged expert in the management of glaucoma has lectured extensively nationwide. Dr. Korey is a Diplomat of the American Board of Ophthalmology, a Fellow of the American Academy of Ophthalmology and a founding member of the Chicago Glaucoma Society. Dr. Korey is a member of the faculty of the University of Illinois School of Medicine and serves as Chief of the Glaucoma Services of both the Mercy Hospital and Medical Center and the Illinois Masonic Medical Center. Dr. Korey is a partner in the Chicago Eye Institute.
David Tresley MD
David J. Tresley, M.D. attended Northwestern University where, as a member of the University’s highly select Honors Program in Medical Education, he received both the Bachelor of Science and M.D. degrees. Following the completion of medical school he completed an internship and specialty residency training in ophthalmology at the Michael Reese Hospital and Medical Center. During his residency training, Dr. Tresley served as Chief Resident in Ophthalmology. Dr. Tresley then pursued further specialty training, completing a formal fellowship in Retina and Vitreous Surgery at the prestigious Massachusetts Eye and Ear Infirmary of Harvard University.
Dr. Tresley’s reputation as an extraordinary surgeon is well deserved. He has been called upon to share his expertise through lectures and workshops presented in a wide array of medical education forums. Dr. Tresley is a Diplomate of the American Board of Ophthalmology and a Fellow of the American Academy of Ophthalmology. Dr. Tresley currently serves as Chief of the Retina Services of the Advocate Illinois Masonic Medical Center and is a partner of the Chicago Eye Institute.
Francisco Marruenda MD
Francisco Marruenda, M.D. received his M.D. degree from the Medical School of the University of Granada in his native homeland of Spain. Subsequently, Dr. Marruenda entered a clinical fellowship in ophthalmology at Chicago’s Cook County Hospital. Upon completion of his fellowship Dr. Marruenda pursued specialty residency training in ophthalmology at Cook County Hospital. Dr. Marruenda is a Diplomate of the American Board of Ophthalmology and a Fellow of the American Academy of Ophthalmology. Dr. Marruenda brings a wealth of state-of-the-art clinical experience to the Chicago Eye Institute.
Harold Sy MD
Harold Sy, M.D. completed his Bachelor of Science degree at the University of Illinois at Urbana/Champaign. He received his M.D. degree from Rush Medical College in Chicago, Illinois. Following a surgical internship at Rush Presbyterian St. Luke’s Medical Center, Dr. Sy completed his ophthalmology residency at the Cook County Hospital/John H. Stroger Jr. Hospital in Chicago where he was recognized for outstanding research. Dr. Sy subsequently pursued further specialty training completing a fellowship in Diseases of the Cornea, Anterior Segment and Refractive Surgery with the Eye Consultants of Atlanta. Dr. Sy is a Diplomate of the American Board of Ophthalmology and a Fellow of the American Academy of Ophthalmology. Dr. Sy is a member of the American Society of Cataract and Refractive Surgery.
Dr. Sy has extensive experience with refractive procedures such as LASIK, IntraLase, PRK and with the use of multifocal lenses for the treatment of cataract. Dr. Sy joined the Chicago Eye Institute in 2007.
Casey Cahill MD
Casey P. Cahill, M.D completed his Bachelor of Science degree at Tulane University in New Orleans, Louisiana, where he graduated with Cum Laude honors in neuroscience. He received his M.D. from Louisiana State University School of Medicine in New Orleans. Following medical school, Dr. Cahill completed an internal medicine internship at Exempla St. Joseph hospital in Denver, Colorado. For his ophthalmology residency, Dr. Cahill attended the University of Texas Health Science Center in San Antonio. Pursuing further specialty training, Dr. Cahill then completed a formal fellowship in the subspecialty of Glaucoma at Northwestern University, where he was trained in laser glaucoma surgery, traditional glaucoma surgery, and Micro-Invasive Glaucoma Surgery (MIGS). Dr. Cahill is board-certified by the American Board of Ophthalmology and is a Fellow of the American Academy of Ophthalmology. Dr. Cahill is a member of the American Glaucoma Society.
After completing his fellowship, Dr. Cahill served on the faculty at University of Texas Health Science Center San Antonio, where he trained budding ophthalmologists in the clinical and surgical management of glaucoma. Dr. Cahill has extensive experience in comprehensive ophthalmology with particular emphasis on cataract and glaucoma surgery, including the innovative Micro-Invasive Glaucoma Surgeries (MIGS).
Amjad Ahmad MD
Dr. Amjad Ahmad specializes exclusively in cosmetic and reconstructive surgery of the face with an emphasis on the eyelid area. He has performed over 15,000 major surgeries and is considered a “super specialist” of the eyelid area which includes cosmetic and reconstructive issues. His practice ranges from small children with congenital ptosis to the elderly who have severe drooping of their eyelids.
Dr. Ahmad is a board certified Ophthalmologist who completed an additional two years of oculofacial surgery training at the University of Michigan. After graduation, he was hired to be the Director of Oculoplastic Surgery at Loyola Medical Center where he was named Teacher of the Year. Dr. Ahmad also received the Best Doctor Award from his peers. Chicago Magazine rated him one of the Top Doctors of Chicago. He has numerous other accolades including Top Doctor in America and has been listed in Who’s Who of Medicine. Dr. Ahmad is also a member of the exclusive and prestigious American Society of Ophthalmic Plastic and Reconstructive Surgery (ASOPRS).
Dr. Ahmad is currently Clinical Assistant Professor at the University of Illinois Eye and Ear Infirmary in Chicago.