About Us

Committed to Excellent Patient Care

Retina Consultants of Carolina has specialized in the evaluation and treatment of all types of retina, vitreous, and macula disorders since 1994. We enjoy an excellent reputation in the Upstate and beyond, providing the latest in treatment techniques and technology. We are involved in research studies and are consistent in offering the most advanced levels in approved treatment to our patients.

In the fields of diagnosis, treatment and research, our abiding principle commitment is delivery of the best patient care. We understand the special challenges of living with retinal problems and do everything possible to alleviate these. We collaborate very closely with your primary care provider and your family doctor throughout your treatment. Our staff and physicians are available anytime should a question or concern arise.

We excel in patient care for elementary-aged children to seasoned adults. We serve in a number of locations across the Upstate, and patients are often referred to us from SC, NC, and GA. At Retina Consultants, a doctor remains on call at all times to meet your needs.


Surgery at Locations You Trust

  • Greenville Health System
  • Bon Secours St. Francis Health System
  • Cross Creek Surgery Center
  • Mary Black Health System
  • AnMed Health Medicus Surgery Center



Meet Our Doctors


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Michael V. Antworth, M.D., M.B.A.

Dr. Michael Antworth graduated from Providence College in Providence, Rhode Island. He received his medical degree from St. Louis University, and after completing his internship, he practiced emergency room medicine. Dr. Antworth went on to practice general ophthalmology at the University of South Florida, where he completed his ophthalmology residency program. He acquired his subspecialty training with a vitreoretinal fellowship program at the University of British Columbia in Vancouver, Canada. After completing his training, he had a successful practice in Tampa, Florida.

In 1994, Michael and his family moved to upstate South Carolina, where he started Retina Consultants of Carolina, P.A. He is currently a participant in ongoing medical and surgical training programs. Dr. Antworth is recognized for contributions to general medical and ophthalmology-specific journals. He serves a two-year rotation as chair of the Ophthalmology Department at Greenville Hospital System and St. Francis Hospital. Recently, Dr. Antworth received his Master’s degree in Business Administration from the University of Massachusetts Amherst.

When he isn’t serving patients or running his practice, Dr. Antworth is reading, biking, or traveling with his wife and four children.

Board Certification: American Board of Ophthalmology

Medical School: St. Louis University

Internship: St. Louis University, Department of Medicine

Residency: University of South Florida

Fellowship: University of British Columbia


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John F. Renfro III, M.D.

Dr. John Renfro grew up in Spartanburg, South Carolina where he attended Spartanburg High School. He stayed in the Upstate and graduated from Clemson University in 1984 and has remained a member of the alumni association ever since.

Dr. Renfro completed his medical degree from the Medical University of South Carolina in Charleston followed by a one year transitional internship at Greenville Memorial Hospital. He went on to obtain his ophthalmology training at the Eye Foundation Hospital/University of Alabama in Birmingham over the course of a three year residency. In addition, Dr. Renfro furthered his training with a two year vitreoretinal fellowship program with Retina and Vitreous Associates of Alabama.

In 1994, Dr. Renfro joined Retina Consultants of Carolina, P.A., after he and his wife moved to Greenville. His career has included extensive clinical and surgical experience, participation in several national clinical research trials, and medical mission work. Dr. Renfro offers his services at the Greenville Free Medical Clinic and is an active member of the South Carolina Society of Ophthalmology.

John, his wife, and three daughters are all actively involved in various activities in the community and enjoy exploring the outdoors.

Board Certification: American Board of Ophthalmology

Medical School: Medical University of South Carolina

Internship: Greenville Memorial Hospital in Greenville, South Carolina

Residency: Eye Foundation Hospital/University of Alabama in Birmingham

Fellowship: Retina and Vitreous Associates of Alabama


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Gregory S. Christensen, M.D.

Dr. Gregory Christensen was born in Minnesota. He completed his B.S. in Medical Technology at Andrews University in 1985 and moved to South Carolina to receive his medical degree from the Medical University of South Carolina.

After a transitional internship at Spartanburg Regional Medical Center, he went to the University of North Carolina at Chapel Hill for a three year ophthalmology residency. In Lexington, Kentucky, he obtained his subspecialty training with a vitreoretinal fellowship at Retina and Vitreous Associates of Kentucky.

Dr. Christensen moved back to South Carolina in 1995 and joined Retina Consultants of Carolina, P.A., in 1997. He has been practicing in Spartanburg/Greenville for twenty years.

Gregory is an avid cyclist. He also enjoys boating, water sports, and traveling with his wife and their two daughters.

Board Certification: American Board of Ophthalmology

Medical School: Medical University of South Carolina

Internship: Spartanburg Regional Medical Center

Residency: University of North Carolina at Chapel Hill

Fellowship: Retina and Vitreous Associates of Kentucky


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Gregg M. Kaiser, M.D.

Dr. Gregg Kaiser was born in Pennsylvania but grew up in Memphis, Tennessee. He attended Vanderbilt University in Tennessee and graduated in 1985. In 1989, he completed his medical degree at the University of Tennessee College of Medicine. After obtaining his medical degree, he completed a transitional internship at Baptist Medical Hospital in Memphis. He then went on to complete the Ophthalmology residency program at The Eye Foundation Hospital/University of Alabama, where he was awarded chief resident in 1992. Dr. Kaiser received his ophthalmology training with a two year vitreoretinal fellowship at Retina and Vitreous Associates of Alabama in Birmingham.

Dr. Kaiser began his career at Retina and Vitreous Associates of Alabama until relocating to Greenville, SC in 1997, where he joined Retina Consultants of Carolina. Dr. Kaiser is a member of the Greenville County Medical Society and the South Carolina Medical Association. He is also a long time member of the American Society of Retina Specialists and the American Academy of Ophthalmology. Dr. Kaiser often volunteers his services at the Greenville Free Medical Clinic.

Dr. Kaiser and his wife reside in Greenville with their three daughters and one son. They are active in their church and enjoy traveling and family camping trips.

Board Certification: American Board of Ophthalmology

Medical School: University of Tennessee

Internship: Baptist Memorial Hospital in Memphis, TN

Residency: The Eye Foundation/University of Alabama in Birmingham

Fellowship: Retinal and Vitreous Associates of Alabama in Birmingham


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James G. Hall, M.D.

Dr. James Hall was born in Raleigh, North Carolina. After completing his bachelor’s degree at the University of North Carolina in Chapel Hill in 1988, he stayed to pursue his medical degree.
After his internship in the department of Internal medicine at New Hanover Regional Medical Center in Wilmington, North Carolina, Dr. Hall completed a residency program in ophthalmology at the University of North Carolina. He obtained his retina/vitreous subspecialty training with Retina and Vitreous Associates of Kentucky.

Dr. Hall joined Retina Consultants of Carolina in 2000 after practicing in Durham, North Carolina from 1997-2000. He and his wife live in Spartanburg with their daughter and twin sons. Dr. Hall enjoys family time, staying involved in his church, boating, fishing, and golf.

Board Certification: American Board of Ophthalmology

Medical School: University of North Carolina in Chapel Hill

Internship: New Hanover Regional Medical Center, Department of Internal Medicine

Residency: University of North Carolina in Chapel Hill

Fellowship: Retina and Vitreous Associates of Kentucky


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Peter L. Goodwin, M.D.

Dr. Peter Goodwin is a second generation ophthalmologist. He was born in Beaufort, South Carolina and grew up in Greenwood, South Carolina. He completed a bachelor’s degree in music at Wake Forest University followed by a Master’s in Piano Performance at the University of North Carolina at Greensboro.

Peter completed his medical degree at the University of South Carolina School of Medicine. He interned at the Carraway Methodist Medical Center in Birmingham, Alabama, and completed a residency in Ophthalmology at the Eye Foundation Hospital associated with the University of Alabama at Birmingham.

Dr. Goodwin went on to complete two fellowships: a one-year retina research and ocular oncology fellowship with the Philadelphia Retina Endowment Fund and Wills Eye Hospital and a two-year surgical vitreoretinal fellowship with Retina Consultants of Alabama in Birmingham. During his surgical fellowship Dr. Goodwin was trained to perform sutureless, small-gauge vitrectomy surgery.

Dr. Goodwin currently lives in Greenville with his wife and four children where he aspires to serve his community. He still enjoys musical performances, as well as all things outdoors, church participation, running, and traveling with his family.

Board Certification: American Board of Ophthalmology

Medical School: University of South Carolina School of Medicine

Internship: Carraway Methodist Medical Center in Birmingham, Alabama

Residency: Eye Foundation Hospital/University of Alabama in Birmingham

Fellowships: Philadelphia Retina Endowment Fund and Wills Eye Hospital

Retina Consultants of Alabama in Birmingham


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Dr. Chris Bergstrom, M.D., O.D.

Dr. Chris Bergstrom was born and raised in Kansas. After completing his bachelor’s degree at Southwestern College he received a doctor of optometry degree from the University of Houston College of Optometry. After a short career as an optometrist he returned to school and received his medical degree from the University of Kansas School of Medicine. He did a transitional internship at The Medical Center in Columbus, GA. Dr. Bergstrom completed his residency in ophthalmology at Emory University serving as chief resident his final year. He stayed at Emory for two years of subspecialty training in retina/vitreous and oncology.

After his training, Dr. Bergstrom remained on staff at Emory University taking care of adult patients with retinal diseases and intraocular tumors. He has extensive experience treating and managing patients with intraocular melanoma. During his career at Emory, he was involved in several clinical trials, given numerous lectures, and has several publications in the literature. He is a member of the American Academy of Ophthalmology and International Society of Ocular Oncology.

Dr. Bergstrom and his wife have three daughters. They all enjoy boating, water sports, exercising, and traveling.

Board Certification: American Board of Ophthalmology

Medical School: University of Kansas of Medicine

Internship: The Medical Center in Columbus, GA

Residency: Emory University

Fellowships: Emory University

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