About Us

The physicians and employees of Ophthalmic Associates, in keeping with the principles set forth by the American Medical Association and the American Academy of Ophthalmology, pledge to strive for optimal eyecare for every patient. We are committed to helping our patients see as well as possible by maintaining the highest degree of excellence in ophthalmic care.

Our practice utilizes state-of-the-art technology with corresponding excellence in support services. All members of Ophthalmic Associates work together to provide leadership by advocating quality patient care, fair and equal employment practices and social responsibility to care for those in need.

Professionalism, compassion, and respect for the dignity and well-being of the whole person are the ideals toward which our physicians and employees constantly strive. We pledge to remain at the forefront of patient care in an environment where technological advances will be pursued with the highest moral and ethical standards.

What Our Patients Are Saying


Our Doctors


Thaddeus Nowinski
M.D.

Thaddeus Nowinski, M.D. is a graduate of the University of Scranton and Jefferson Medical College. He completed an internship at Pennsylvania Hospital and his residency at Wills Eye Hospital.

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Colleen Christian
M.D.

Colleen Christian, M.D. is a graduate of the University of California, Los Angeles, and Case Western Reserve University School of Medicine.

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Thomas J. O’Connor
M.D.

Thomas J. O’Connor, M.D. is a graduate of Boston College. He completed his medical training at Tufts University School of Medicine, and his ophthalmology residency training at Eye and Ear Hospital at the University of Pittsburgh.

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Geoffrey P. Schwartz
M.D.

Geoffrey P. Schwartz M.D. is a graduate of Bowdoin College, Columbia University and Jefferson Medical College.

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Melissa R. Sieber
M.D.

Melissa R. Sieber, MD is a graduate of Gettysburg College where she majored in physics with special interest in the medical applications of lasers.

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Robert Gladnick
O.D.

Robert Gladnick, O.D. graduated from Pennsylvania’s College of Optometry and obtained his undergraduate degree from Philadelphia College of Textile and Science with a B.S. degree in Life Sciences.

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Office Information


Office Hours

Monday & Tuesday: 8:00am – 7:30pm

Wednesday: 7:00am – 7:30pm

Thursday: 7:30am – 7:00pm

Friday: 8:00am – 3:30pm

Saturday: 8:00am – 12:00pm


Contact Information
1000 N Broad Street
Lansdale PA 19446
United States

Tel: (215) 368 - 1646

Fax: (215) 368 - 8516


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