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Mark E. Patron, MD, is a board-certified ophthalmologist and retina surgeon who sees patients at Mile High Retina's main location in Denver, Colorado. He moved from the East Coast to Denver in 2012 and worked with a group practice prior to starting Mile High Retina in 2020.  

Born and raised in Indianapolis, Indiana, Dr. Patron is Ivy League-educated and graduated from the University of Pennsylvania with honors. He earned his medical degree from Tufts University School of Medicine in Boston, Massachusetts, graduating at the top of his class with Alpha Omega Alpha honors. He completed his ophthalmology residency at the New England Eye Center at Tufts Medical Center. He finished his training with a two-year retina fellowship at the surgery-intensive combined Retina Group of Washington, Georgetown University Hospital, and Washington Hospital Center program in the DC area.

Dr. Patron is a highly-trained, vitreoretinal surgeon who treats a wide variety of eye diseases, including retinal tears, retinal detachments, age-related macular degeneration, and retinal manifestations of systemic disease. With advanced exposure during training, he takes a special interest in diabetic retinopathy, especially the surgical repair of complex diabetic tractional retinal detachments. He is board certified by the American Board of Ophthalmology. He has published scientific papers and presented research at national ophthalmology meetings. He is a member of the American Academy of Ophthalmology and the American Society of Retina Specialists. 

When not in the clinic, Dr. Patron can be found exercising at the gym or running laps around Washington Park. His Sundays are spent with a morning at church, followed by a neighborhood coffee shop, brunch with the family, a lazy afternoon watching sports, or shuttling his young kids, Andrew and Isabel, around to their extracurricular activities. In addition to their children, Dr. Patron and his wife Erika, a gastroenterologist with South Denver Gastroenterology, also have three French bulldogs – Oscar, Gemma, and Duke. As a family, they enjoy traveling, especially for food and wine, as they are always on the lookout for authentic dining experiences.

Ross Chod, MD, is a board-certified ophthalmologist and retina specialist at Retina Specialists of Colorado in Aurora, Colorado. Dr. Chod specializes in treating injuries and diseases to the retina or the vitreous, the gel-like substance that makes up most of the eye.

After growing up in St. Louis, Missouri, Dr. Chod received his medical degree from the Tulane University School of Medicine. Once he had honed in on his specialty, Dr. Chod completed his ophthalmology residency at St. Louis University, where he earned a place at the prestigious New York Eye and Ear Infirmary in New York City, further mastering vitreoretinal surgery.

Throughout his education and career, Dr. Chod has been published in numerous esteemed ophthalmic journals and has presented papers on his work at national ophthalmology meetings.

When he is out of the office, Dr. Chod enjoys staying active with skiing, golf, and hockey, among other sports. He and his wife have no trouble staying active with their growing family of four.

Dennis J. O'Connell, DO, "Denny", is an ophthalmologist and retina specialist who focuses on the treatment of conditions and diseases of the vitreous and retina. He sees patients at InSight Retina Consultants, P.C., with locations in Aurora, Denver, Glenwood Springs and Edwards, Colorado. Dr. O'Connell has been practicing since 1995 and has developed a reputation as a highly-skilled and knowledgeable surgeon. Patients and referring doctors frequently appreciate Dr. O'Connell for making himself available weekdays or weekends as well as early or late in the day to preserve vision.  Having come from a large multi-specialty ophthalmology practice, Dr. O’Connell chose to establish InSight Retina Consultants, P.C. to be able to offer more personalized care and to offer patients the full range of treatment options to preserve vision and to reduce the probability of requiring additional eye surgeries in the future.

Dr. O'Connell is a strong advocate and supporter of optometry in the State of Colorado. He has on two occasions supported optometrists at the legislative level and continues to show support by conducting OCT Club meetings covering a variety of vitreoretinal diseases.

When Dr. O'Connell finds time to step out of the office, he can often be found cycling through some of Colorado's finest roads or traveling. In May of 2011, Dr. O'Connell participated as a volunteer retinologist at the Lumbini Eye Institute in Nepal. During his journey, he hoped to be able to share his experiences as a novice traveler to this part of the globe, and to offer his perspective of the host culture and environment. The Lumbini Eye Institute was established by Seva Foundation. Of historical and spiritual interest, Lumbini is the birthplace of the Buddha. You are welcome to read about Dr. O'Connell's trip to Nepal where he shares a visual and written account in his personal blog, Eyes Wide Open.

William Richheimer, MD, is a skilled ophthalmologist and the founder of Mile High Eye Institute, which has locations in Englewood, Broomfield, and Edwards, Colorado, as well as Goodland, Kansas. 

Dr. Richheimer fell in love with Colorado during his residency at Denver’s St. Joseph’s hospital. After leaving to complete his training at world-renowned eye centers, Dr. Richheimer returned to Colorado. In 2008, he realized his dream of creating his own leading-edge vision care practice, Mile High Eye Institute. 

As a leader in ophthalmology, Dr. Richheimer was the first fellow in the United States to be fully certified in the Staar Implantable Contact Lens, the first U.S. surgeon to perform ultra-thin DSEK, and one of only a few local surgeons who performs corneal cross-linking. Dr. Richheimer stays at the forefront of cataract surgery, providing the most advanced techniques and all options for lens implant technology. 

Dr. Richheimer enjoys giving back to the community through teaching and volunteering. On numerous occasions, he has provided surgical care in underserved countries. In his spare time, he relishes adventures with his family, as well as working towards his goal of becoming an iron-distance triathlete.

Dennis J. O'Connell, DO, "Denny", is an ophthalmologist and retina specialist who focuses on the treatment of conditions and diseases of the vitreous and retina. He sees patients at InSight Retina Consultants, P.C., with locations in Aurora, Denver, Glenwood Springs and Edwards, Colorado. Dr. O'Connell has been practicing since 1995 and has developed a reputation as a highly-skilled and knowledgeable surgeon. Patients and referring doctors frequently appreciate Dr. O'Connell for making himself available weekdays or weekends as well as early or late in the day to preserve vision.  Having come from a large multi-specialty ophthalmology practice, Dr. O’Connell chose to establish InSight Retina Consultants, P.C. to be able to offer more personalized care and to offer patients the full range of treatment options to preserve vision and to reduce the probability of requiring additional eye surgeries in the future.

Dr. O'Connell is a strong advocate and supporter of optometry in the State of Colorado. He has on two occasions supported optometrists at the legislative level and continues to show support by conducting OCT Club meetings covering a variety of vitreoretinal diseases.

When Dr. O'Connell finds time to step out of the office, he can often be found cycling through some of Colorado's finest roads or traveling. In May of 2011, Dr. O'Connell participated as a volunteer retinologist at the Lumbini Eye Institute in Nepal. During his journey, he hoped to be able to share his experiences as a novice traveler to this part of the globe, and to offer his perspective of the host culture and environment. The Lumbini Eye Institute was established by Seva Foundation. Of historical and spiritual interest, Lumbini is the birthplace of the Buddha. You are welcome to read about Dr. O'Connell's trip to Nepal where he shares a visual and written account in his personal blog, Eyes Wide Open.

William Richheimer, MD, is a skilled ophthalmologist and the founder of Mile High Eye Institute, which has locations in Englewood, Broomfield, and Edwards, Colorado, as well as Goodland, Kansas. 

Dr. Richheimer fell in love with Colorado during his residency at Denver’s St. Joseph’s hospital. After leaving to complete his training at world-renowned eye centers, Dr. Richheimer returned to Colorado. In 2008, he realized his dream of creating his own leading-edge vision care practice, Mile High Eye Institute. 

As a leader in ophthalmology, Dr. Richheimer was the first fellow in the United States to be fully certified in the Staar Implantable Contact Lens, the first U.S. surgeon to perform ultra-thin DSEK, and one of only a few local surgeons who performs corneal cross-linking. Dr. Richheimer stays at the forefront of cataract surgery, providing the most advanced techniques and all options for lens implant technology. 

Dr. Richheimer enjoys giving back to the community through teaching and volunteering. On numerous occasions, he has provided surgical care in underserved countries. In his spare time, he relishes adventures with his family, as well as working towards his goal of becoming an iron-distance triathlete.