Our Ophthalmologists

Alexander Chang, MD

Alexander Chang, M.D., has been practicing in the South Hills area for over 30 years. He earned his Bachelor’s degree at Case Western Reserve University in 1972, majoring in Chemistry graduating Phi Beta Kappa. He also earned his Medical degree at Case Western Reserve University School of Medicine in 1976 and completed his internship there. Dr. Chang completed his ophthalmology training at the University of Pittsburgh and has been practicing ophthalmology in Pittsburgh ever since. In 1990, he founded Chang Eye Group.

Dr. Chang is a highly respected and leading cataract surgeon in the tristate area and has performed well over 20,000 cataract surgeries. He also provides medical eye care for patients with glaucoma, diabetes, and macular degeneration.

Dr. Chang is affiliated with St. Clair Memorial Hospital. Because Dr. Chang’s practice is privately owned he is able to accept insurance from both Highmark and UPMC.

Erik Happ, MD

Erik Happ, M.D., earned his medical degree from Hahnemann University, completed a general surgery internship at the National Naval Medical Center and Flight Surgery Training at the Naval Operational Medicine Institute. After serving five years in the United States Navy, he completed his ophthalmology residency at the University of Pittsburgh’s Eye and Ear Institute followed by a fellowship in the departments of Ophthalmology and Neurosurgery at AGH.

He is an avid supporter of the non-profit Hawaiian Eye Foundation, SEE International and American. These organizations are dedicated to promoting the preservation, restoration, and improvement of vision for underserved people of the Pacific Basin through charitable service, education, and research programs. He has traveled with the support of these foundations several times to Vietnam to treat patients who have no access to subspecialty care and provide invaluable training for local physicians and surgeons. He also helped establish a fellowship program in the United States to train Vietnamese ophthalmologists and is co-director of the oculoplastic and orbital surgery fellowship program at AGH. With over 20 years of experience, Dr. Happ also offers facial aesthetic services at Chang Eye Group.

Dr. Happ is a member of the North American Neuro-ophthalmology Society, American Academy of Ophthalmology and Society of US Naval Flight Surgeons.

Michael Alunni, MD

Dr. Michael Alunni, M.D., graduated with honors from Jefferson Medical College Of Thomas Jefferson University in 2005. He received his medical degree from Sidney Kimmel Medical College . His residency was completed at UPMC Eye Center and achieved his fellowship graduation from Allegheny Ophthalmic and Orbital Associates. Dr. Alunni is a member of the American Board of Ophthalmology.

Having more than 13 years of diverse experiences, especially in ophthalmology, glaucoma and cataracts, Dr. Michael A Alunni affiliates with many hospitals including Allegheny General Hospital, St Clair Hospital, and UPMC Passavant.

Valli Muthappan, MD

Valli Muthappan, MD, received her undergraduate degree at Northwestern University in Chicago, IL, where she graduated Magna Cum Laude. She received her Doctrine of Medicine from Washington University where she was inducted in Alpha Omega Alpha, the medical honors society. Dr. Valli completed her surgical residency at Wilmer Eye Institute of Johns Hopkins Hospital in Baltimore, MD and her fellowship in cornea and refractive surgery at Moran Eye Center, University of Utah. She is a board certified by the American Board of Ophthalmology and a member of the American Academy of Ophthalmology as well as the American Society of Cataract and Refractive Surgeons.

Dr. Valli specializes in cataract surgery as well a wide variety of corneal diseases including viral and bacterial infections, dry eye, keratoconus, corneal scars and Fuch’s corneal dystrophy. She is experienced in performing cataract surgery as well as corneal procedures. She has performed over 5,000 eye surgeries, and has published papers in the Journal of Cataract and Refractive Surgery, Cornea, and Clinical Ophthalmology. She has received recognition for her presentations in the US and abroad.

Additionally, Dr. Valli is adept at correcting vision to reduce or eliminate dependency on glasses. Based on what is best for the patient, she performs LASIK, PRK, places intraocular collamer lens (ICL), along with other refractive surgical options.

She is a native of Murrysville, PA, and attended high school at Shady Side Academy. In her free time, she likes to go running with her husband and taking long walks with her son.

Alexander Chang, MD

Alexander Chang, M.D., has been practicing in the South Hills area for over 30 years. He earned his Bachelor’s degree at Case Western Reserve University in 1972, majoring in Chemistry graduating Phi Beta Kappa. He also earned his Medical degree at Case Western Reserve University School of Medicine in 1976 and completed his internship there. Dr. Chang completed his ophthalmology training at the University of Pittsburgh and has been practicing ophthalmology in Pittsburgh ever since. In 1990, he founded Chang Eye Group.

Dr. Chang is a highly respected and leading cataract surgeon in the tristate area and has performed well over 20,000 cataract surgeries. He also provides medical eye care for patients with glaucoma, diabetes, and macular degeneration.

Dr. Chang is affiliated with St. Clair Memorial Hospital. Because Dr. Chang’s practice is privately owned he is able to accept insurance from both Highmark and UPMC.

Erik Happ, MD

Erik Happ, M.D., earned his medical degree from Hahnemann University, completed a general surgery internship at the National Naval Medical Center and Flight Surgery Training at the Naval Operational Medicine Institute. After serving five years in the United States Navy, he completed his ophthalmology residency at the University of Pittsburgh’s Eye and Ear Institute followed by a fellowship in the departments of Ophthalmology and Neurosurgery at AGH.

He is an avid supporter of the non-profit Hawaiian Eye Foundation, SEE International and American. These organizations are dedicated to promoting the preservation, restoration, and improvement of vision for underserved people of the Pacific Basin through charitable service, education, and research programs. He has traveled with the support of these foundations several times to Vietnam to treat patients who have no access to subspecialty care and provide invaluable training for local physicians and surgeons. He also helped establish a fellowship program in the United States to train Vietnamese ophthalmologists and is co-director of the oculoplastic and orbital surgery fellowship program at AGH. With over 20 years of experience, Dr. Happ also offers facial aesthetic services at Chang Eye Group.

Dr. Happ is a member of the North American Neuro-ophthalmology Society, American Academy of Ophthalmology and Society of US Naval Flight Surgeons.

Michael Alunni, MD

Dr. Michael Alunni, M.D., graduated with honors from Jefferson Medical College Of Thomas Jefferson University in 2005. He received his medical degree from Sidney Kimmel Medical College . His residency was completed at UPMC Eye Center and achieved his fellowship graduation from Allegheny Ophthalmic and Orbital Associates. Dr. Alunni is a member of the American Board of Ophthalmology.

Having more than 13 years of diverse experiences, especially in ophthalmology, glaucoma and cataracts, Dr. Michael A Alunni affiliates with many hospitals including Allegheny General Hospital, St Clair Hospital, and UPMC Passavant.

Valli Muthappan, MD

Valli Muthappan, MD, received her undergraduate degree at Northwestern University in Chicago, IL, where she graduated Magna Cum Laude. She received her Doctrine of Medicine from Washington University where she was inducted in Alpha Omega Alpha, the medical honors society. Dr. Valli completed her surgical residency at Wilmer Eye Institute of Johns Hopkins Hospital in Baltimore, MD and her fellowship in cornea and refractive surgery at Moran Eye Center, University of Utah. She is a board certified by the American Board of Ophthalmology and a member of the American Academy of Ophthalmology as well as the American Society of Cataract and Refractive Surgeons.

Dr. Valli specializes in cataract surgery as well a wide variety of corneal diseases including viral and bacterial infections, dry eye, keratoconus, corneal scars and Fuch’s corneal dystrophy. She is experienced in performing cataract surgery as well as corneal procedures. She has performed over 5,000 eye surgeries, and has published papers in the Journal of Cataract and Refractive Surgery, Cornea, and Clinical Ophthalmology. She has received recognition for her presentations in the US and abroad.

Additionally, Dr. Valli is adept at correcting vision to reduce or eliminate dependency on glasses. Based on what is best for the patient, she performs LASIK, PRK, places intraocular collamer lens (ICL), along with other refractive surgical options.

She is a native of Murrysville, PA, and attended high school at Shady Side Academy. In her free time, she likes to go running with her husband and taking long walks with her son.

Our Optometrists

Michele Schraeder, OD

Michele Schraeder, OD, earned her Bachelor’s degree at the Indiana University of Pennsylvania and earned her Doctor of Optometry degree at Pennsylvania College of Optometry. She has been with the Chang Eye Group since completing her optometry training in 1997. Dr. Schraeder is a member of the American Optometric Association, the Western Pennsylvania Optometric Association, and is certified by the National Board of Contact Lens Examiners.

As a Dry Eye Institute graduate, Dr. Schraeder studied the development of equipment and protocols that help the underlying causes of dry eye and ocular surface diseases. She is dedicated to educating each patient on dry eye disease, the causes as well as the best treatment to help improve symptoms and create successful outcomes.

As a contact lens specialist, Dr. Schraeder often fits specialized contact lenses that correct astigmatism or both near and far vision (multifocal). Dr. Schraeder provides pre-op and post-op care to patients who choose to undergo LASIK. She also provides primary eye care to patients of all ages.

Kristi Weatherly, OD

Dr. Kristi Weatherly, O.D. graduated Magna Cum Laude from the Clarion University of Pennsylvania with a Bachelor of Science Degree. She earned her Doctor of Optometry Degree from the Pennsylvania College of Optometry with honors in clinical excellence in primary care. Dr. Weatherly is an active member of the American Optometric Association (AOA), Pennsylvania Optometric Association (POA), and Western Pennsylvania Optometric Society (WPOS). She is certified by the National Board of Contact Lens Examiners and has participated in numerous research projects concentrating on contact lens complications and anterior segment disease. Dr. Weatherly focuses her practice on primary eye care, contact lenses, pediatrics, cataract and LASIK co-management and low vision. Dr. Weatherly welcomes patients of all ages.

Michele Schraeder, OD

Michele Schraeder, OD, earned her Bachelor’s degree at the Indiana University of Pennsylvania and earned her Doctor of Optometry degree at Pennsylvania College of Optometry. She has been with the Chang Eye Group since completing her optometry training in 1997. Dr. Schraeder is a member of the American Optometric Association, the Western Pennsylvania Optometric Association, and is certified by the National Board of Contact Lens Examiners.

As a Dry Eye Institute graduate, Dr. Schraeder studied the development of equipment and protocols that help the underlying causes of dry eye and ocular surface diseases. She is dedicated to educating each patient on dry eye disease, the causes as well as the best treatment to help improve symptoms and create successful outcomes.

As a contact lens specialist, Dr. Schraeder often fits specialized contact lenses that correct astigmatism or both near and far vision (multifocal). Dr. Schraeder provides pre-op and post-op care to patients who choose to undergo LASIK. She also provides primary eye care to patients of all ages.

Kristi Weatherly, OD

Dr. Kristi Weatherly, O.D. graduated Magna Cum Laude from the Clarion University of Pennsylvania with a Bachelor of Science Degree. She earned her Doctor of Optometry Degree from the Pennsylvania College of Optometry with honors in clinical excellence in primary care. Dr. Weatherly is an active member of the American Optometric Association (AOA), Pennsylvania Optometric Association (POA), and Western Pennsylvania Optometric Society (WPOS). She is certified by the National Board of Contact Lens Examiners and has participated in numerous research projects concentrating on contact lens complications and anterior segment disease. Dr. Weatherly focuses her practice on primary eye care, contact lenses, pediatrics, cataract and LASIK co-management and low vision. Dr. Weatherly welcomes patients of all ages.

Better Vision Starts Here

Flexible appointments with credentialed and highly qualified eye care professionals.

Or call — 412 429 2020

Kindness, knowledge, and care.

Eye doctors who put your needs first.

GREENTREE

2101 Greentree Rd. #105, Pittsburgh, PA

PETERS TOWNSHIP

3380 Washington Rd. Canonsburg, PA