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Marianne Cowley

Marianne Cowley, MD

Retina and Vitreous Diseases

Accepting New Patients
Online Booking

Highlights

Age Groups Seen

  • Young Adult 18-25
  • Adult 26-64
  • Older Adult 65+

Languages

  • English

Gender

Female

Johns Hopkins Affiliations:

  • Johns Hopkins School of Medicine

About Marianne Cowley

Johns Hopkins Physician

Logo for Johns Hopkins Physician

Background

Marianne Cowley, M.D., is a clinical associate of ophthalmology and retina specialist at the Wilmer Eye Institute's Green Spring Station and Odenton, Maryland locations. Dr. Cowley specializes in the diagnosis and treatment of conditions such as age-related macular degeneration (dry and wet) and diabetic retinopathy.

Dr. Cowley comes from private practice where she has focused on clinical excellence and patient experience in retinal care. For many years, Dr. Cowley volunteered her services with the University of Louisville and has made trips internationally to assist in providing retinal care. 

Research Interests

Vitreoretinal diseases (retina and vitreous)

Locations

  1. Johns Hopkins Health Care Center - Odenton
  2. The Johns Hopkins Hospital
    • 1800 Orleans Street, Maumenee Lobby, Baltimore, MD 21287
    • Get Directions
  3. Johns Hopkins Health Care & Surgery Center - Green Spring Station, Lutherville
    • 10753 Falls Road, Pavilion II STE 455, Lutherville, MD 21093
    • Get Directions

Expertise

Education

  • Fellowship: UVA Health University Medical Center, Ophthalmology, 1988
  • Residency: University of Louisville Health, Ophthalmology, 1987
  • Residency: Ochsner Clinic Foundation, Ophthalmology, 1985
  • Medical Education: Albany Medical College, MD Medicine, MD, 1982

Board Certifications

  • Ophthalmology: American Board of Ophthalmology, 1989

Insurance

Please contact the location directly to confirm your health plan is accepted.
Search plans
  • Aetna
  • CareFirst
  • Cigna
  • First Health
  • Geisinger Health Plan
  • HealthSmart/Accel
  • Johns Hopkins Health Plans
  • MultiPlan
  • Pennsylvania's Preferred Health Networks (PPHN)
  • Point Comfort Underwriters
  • Private Healthcare Systems (PHCS)
  • Veteran Affairs Community Care Network (Optum-VACCN)

Ratings & Reviews

4.7 out of 5

324 ratings, 121 reviews

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

Overall Rating by Patient
Provider Listened Carefully
Provider Explained Things Clearly
Provider Knew Medical History
Provider Showed Respect
Provider Spent Enough Time
Search reviews
    5 out of 5 stars
    Reviewed on 3/23/2026

    Outstanding doctor

    5 out of 5 stars
    Reviewed on 3/17/2026

    Very knowledgeable and explained info thoroughly

    5 out of 5 stars
    Reviewed on 3/17/2026

    Excellent

    3 out of 5 stars
    Reviewed on 3/12/2026

    Everything went well. However there was a very long wait. The appointment was scheduled for 10:30 am.

    5 out of 5 stars
    Reviewed on 3/10/2026

    Dr. Cowley is definitely worth any wait.

    5 out of 5 stars
    Reviewed on 3/10/2026

    Very careful and thorough.

    5 out of 5 stars
    Reviewed on 3/9/2026

    All good

    5 out of 5 stars
    Reviewed on 3/3/2026

    She is most informative! Takes time to explain all my concerns! She is the best provider & I feel very comfortable with her.

    5 out of 5 stars
    Reviewed on 3/3/2026

    Extremely knowledgeable about my medical problem. Had spent time reviewing my medical history. Had arrived at a well-thought out decision above my best course of action. I am most confident in her decision

    5 out of 5 stars
    Reviewed on 2/23/2026

    Excellent

    5 out of 5 stars
    Reviewed on 2/16/2026

    Professional, knowledgeable and patient.

    5 out of 5 stars
    Reviewed on 2/10/2026

    Felt very comfortable with providervisit

    5 out of 5 stars
    Reviewed on 2/10/2026

    My Dr is very professional, knowledgeable and understanding of my eye disease. I have recommend my Dr to family and friends.

    5 out of 5 stars
    Reviewed on 2/10/2026

    Dr. Cowley did a great job!

    5 out of 5 stars
    Reviewed on 2/10/2026

    Everything was easy to foiiow and understand

    5 out of 5 stars
    Reviewed on 2/9/2026

    Dr Cowley is a knowledgable and caring doctor.

    5 out of 5 stars
    Reviewed on 2/3/2026

    Dr. Cowley is very detailed and precise with injections and laser. She answers all questions and discusses the plan of care. On this visit day, there was a slight delay due to weather issues, but still proceeded rather smoothly. Not a problem for me.

    5 out of 5 stars
    Reviewed on 2/3/2026

    I feel very confident in my provider and believe I am receiving the best treatment possible.

    5 out of 5 stars
    Reviewed on 2/3/2026

    Dr Cowley is always very thorough and works to coordinate my care with [staff]

    5 out of 5 stars
    Reviewed on 1/30/2026

    Dr Cowley listened to my concerns and advised me what to do for my AMD.

    5 out of 5 stars
    Reviewed on 1/30/2026

    I trust her experience. She is deliberate and careful.

    5 out of 5 stars
    Reviewed on 1/30/2026

    She was very caring

    5 out of 5 stars
    Reviewed on 1/27/2026

    This provider always make sure that I will get an interpreter.

    5 out of 5 stars
    Reviewed on 1/20/2026

    Dr. Cowley is an excellent specialist. I have confidence in her medical experience and advice. She has a good rapport with patients and explains things in an easy-to-understand way. She is a valuable asset to the Odenton Wilmer Clinic, and I am glad that she is my eye doctor for retinal care.

    5 out of 5 stars
    Reviewed on 1/20/2026

    She is fantastic

    5 out of 5 stars
    Reviewed on 1/20/2026

    Dr. Cowley excellent care , treatment and service .

    5 out of 5 stars
    Reviewed on 1/12/2026

    Very knowledgeable. A very good experience

    5 out of 5 stars
    Reviewed on 1/8/2026

    Excellent!

    5 out of 5 stars
    Reviewed on 1/8/2026

    Very nice and concerned about my condition

    5 out of 5 stars
    Reviewed on 1/8/2026

    Very knowledgeable

    5 out of 5 stars
    Reviewed on 1/6/2026

    Dr. Cowley is an excellent doctor in her field.

    5 out of 5 stars
    Reviewed on 1/6/2026

    Good

    5 out of 5 stars
    Reviewed on 1/5/2026

    I enjoy coming here. They take real good care of me in my eyes.

    5 out of 5 stars
    Reviewed on 1/5/2026

    Great

    5 out of 5 stars
    Reviewed on 1/5/2026

    Dr. Cowley is very thorough, explains things in a way that is easy to understand, and gives her recommendations.

    5 out of 5 stars
    Reviewed on 1/5/2026

    Very caring and interested in my progress at next visit. She gave me her personal phone # to inform her of any vision problems.

    5 out of 5 stars
    Reviewed on 12/23/2025

    I have great confidence in her.

    5 out of 5 stars
    Reviewed on 12/16/2025

    Professional and knowledgeable

    5 out of 5 stars
    Reviewed on 12/15/2025

    Dr Cowley was knowledgeable and professional. She patiently answered my questions about my imaging and gave me confidence that my condition would be followed in the future.

    5 out of 5 stars
    Reviewed on 12/11/2025

    Dr Cowley is focused and cautious with her recommendations. I feel very confident but the follow up treatment I am receiving from her. She is easy to talk to and answers my questions clearly

    5 out of 5 stars
    Reviewed on 12/11/2025

    Everyone was polite and did a good job

    5 out of 5 stars
    Reviewed on 12/9/2025

    Very happy with my eye doctor care

    4 out of 5 stars
    Reviewed on 12/9/2025

    Dr. Cowley was very focus on seeing the present condition of my left eye after performing surgery at the last visit. However, she did not comment on what she saw when she examined me. She simply said come back in two months.

    5 out of 5 stars
    Reviewed on 12/2/2025

    Excellent care and support from Dr Cowley

    5 out of 5 stars
    Reviewed on 12/2/2025

    My provider currently is Doctor Cowley. My previous three doctors were very good but Dr Cowley is without a doubt the best.

    5 out of 5 stars
    Reviewed on 12/2/2025

    Provider is excellent!

    5 out of 5 stars
    Reviewed on 12/2/2025

    Dr Cowley is an excellent provider. She listens and explains things clearly. She is meticulous with my eyeInjections. She is precise and quick causing very little pain. Dr Cowley has given me the best injections of any provider since 2009! She considers problems from my past, including corneal abrasions when providers used gel numbing agents. It was miserable. She uses drops efficiently. Her procedure is consistent and meticulous.

    5 out of 5 stars
    Reviewed on 12/1/2025

    Exactly the provider I needed to explain my condition and allay my concerns.

    3 out of 5 stars
    Reviewed on 11/24/2025

    She was very short

    5 out of 5 stars
    Reviewed on 11/24/2025

    Very helpful explaining my eye condition and future expectations

    5 out of 5 stars
    Reviewed on 11/24/2025

    Seemed very knowledgeable and nice pleasant person.

    5 out of 5 stars
    Reviewed on 11/18/2025

    She is very knowledgeable about my eyes condition. Very professional and thorough.

    5 out of 5 stars
    Reviewed on 11/18/2025

    Dr. Cowley is very good.

    5 out of 5 stars
    Reviewed on 11/13/2025

    JHH, JHM, The Wilmer Eye Clinic has been taking care of me since 1986 (39 years). They have always treated me extremely well.

    5 out of 5 stars
    Reviewed on 11/13/2025

    She was very professional. She explained my situation very well. Made me have confidence in her abilities to help me.

    5 out of 5 stars
    Reviewed on 11/10/2025

    I am very pleased with the care Dr. Cowley has provided me.

    3 out of 5 stars
    Reviewed on 11/3/2025

    The Provider's was not personable at all and didn't speak at a level that was understandable.

    5 out of 5 stars
    Reviewed on 11/3/2025

    Good!

    5 out of 5 stars
    Reviewed on 11/3/2025

    She provides her cell phone number, which was much appreciated when I had to call that evening about a problem.

    5 out of 5 stars
    Reviewed on 10/31/2025

    Marianne Cowley is excellent at her job.

    4 out of 5 stars
    Reviewed on 10/21/2025

    I really saw two people at this visit. When was [staff] Who you are not asking about and then Dr. Cowley. I thought they were both excellent.

    5 out of 5 stars
    Reviewed on 10/21/2025

    Dr Cowley is very thorough and takes the whole person into account. She listens and addresses all your concerns.

    2 out of 5 stars
    Reviewed on 10/21/2025

    One hour late for the appointment!

    2 out of 5 stars
    Reviewed on 10/20/2025

    Appt was 9am. She saw us at 9:35. We wanted an optical appt and didn't get that.

    5 out of 5 stars
    Reviewed on 10/20/2025

    Not real warm and fuzzy but straightforward

    5 out of 5 stars
    Reviewed on 10/20/2025

    Very professional

    5 out of 5 stars
    Reviewed on 10/17/2025

    1st seeing this doctor I immediately liked her

    5 out of 5 stars
    Reviewed on 10/14/2025

    Great provider

    5 out of 5 stars
    Reviewed on 10/7/2025

    Dr Cowley was amazing. She was very caring, professional and compassionate

    5 out of 5 stars
    Reviewed on 10/6/2025

    Dr. Was very thorough.

    5 out of 5 stars
    Reviewed on 9/29/2025

    Thorough in getting the best information possible fromDiagnostic tests to make her diagnosis and treatment plan with photodynamic therapy.

    4 out of 5 stars
    Reviewed on 9/26/2025

    LIMITED UNDERSTANDING OF SITUATION. STAND-IN FOR DOCTOR ON LEAVE

    5 out of 5 stars
    Reviewed on 9/23/2025

    She is patient and gives good self care advice

    4 out of 5 stars
    Reviewed on 9/16/2025

    Never uses the slit lamp to look in my eyes.Injects the medication in the inner aspect of my eye which no one has ever done before.

    3 out of 5 stars
    Reviewed on 9/16/2025

    She is a excellent doc Im sure..felt it was cut and dry..this is problem, solution, good bye.Short reply to questions

    4 out of 5 stars
    Reviewed on 9/16/2025

    I'm a bit confused about my eye care. One person said my file noted macular degeneration while the doctor said my eyes show normal eye progression

    5 out of 5 stars
    Reviewed on 9/15/2025

    I was very impressed with Dr Cowley, she explained everything to me very clearly

    5 out of 5 stars
    Reviewed on 9/12/2025

    Very clear, matter of fact, responsive listener

    5 out of 5 stars
    Reviewed on 9/9/2025

    Dr Cowley provides expert care with eye injections, uses new techniques while injecting and has provided new options for improved vision.

    4 out of 5 stars
    Reviewed on 9/9/2025

    Having visited other health practices in the last couple years, I find that for the most part, John's Hopkins provides the n best care available in the area.

    5 out of 5 stars
    Reviewed on 9/8/2025

    Polite, clear, thorough

    5 out of 5 stars
    Reviewed on 9/2/2025

    Great service!

    5 out of 5 stars
    Reviewed on 8/18/2025

    First visit with this doctor and I felt very comfortable with her.

    5 out of 5 stars
    Reviewed on 8/18/2025

    I receive a monthly injection in my right eye for AMD and know am I getting the best possible care from her.

    3 out of 5 stars
    Reviewed on 8/14/2025

    Not enough time examining g me.

    5 out of 5 stars
    Reviewed on 8/14/2025

    Very caring and thorough in explanation of examination findings

    5 out of 5 stars
    Reviewed on 8/11/2025

    She answered my questions and explained things clearly

    5 out of 5 stars
    Reviewed on 8/5/2025

    Excellent care, in depth knowledge and experience.

    5 out of 5 stars
    Reviewed on 8/4/2025

    Dr. Cowley is an excellent caring doctor.

    5 out of 5 stars
    Reviewed on 7/29/2025

    Gave me a good 2nd opinion

    2 out of 5 stars
    Reviewed on 7/29/2025

    The doctor has no concern

    5 out of 5 stars
    Reviewed on 7/22/2025

    Astute, highly experienced, old school practitioner

    5 out of 5 stars
    Reviewed on 7/15/2025

    First visit. Hope Dr. Cowley stays...liked her a lot.

    5 out of 5 stars
    Reviewed on 7/15/2025

    This was the first time ive seen this provider and she was excellent. Ive already scheduled my annaual visit for next year.

    5 out of 5 stars
    Reviewed on 7/15/2025

    She is kind and knowledgeable. She has gone out of her way to provide me with the best care.

    5 out of 5 stars
    Reviewed on 7/15/2025

    Dr Cowley is terrific and each time she has seen me I've come away pleased to have spent time with her. She's really great!

    5 out of 5 stars
    Reviewed on 7/14/2025

    Dr. Cowley is careful and knowledgeable

    5 out of 5 stars
    Reviewed on 7/14/2025

    Top Notch

    1 out of 5 stars
    Reviewed on 7/8/2025

    Had not reviewed my chart before seeing me. No exchange of information between the doctors in the office.

    3 out of 5 stars
    Reviewed on 7/1/2025

    Dr. Cowley has no pleasant personality.

    5 out of 5 stars
    Reviewed on 6/24/2025

    This center provided excellent care and answered all of my questions and concerns

    5 out of 5 stars
    Reviewed on 6/17/2025

    She was new to me and I was very happy with her expertise.

    5 out of 5 stars
    Reviewed on 6/17/2025

    Very good

    5 out of 5 stars
    Reviewed on 6/16/2025

    Dr Cowley very knowledgeable. She doesn't waste time

    5 out of 5 stars
    Reviewed on 6/16/2025

    Very good

    5 out of 5 stars
    Reviewed on 6/10/2025

    The provider is knowledgeable

    5 out of 5 stars
    Reviewed on 5/22/2025

    Very knowledgeable of my eye situation and helpful

    5 out of 5 stars
    Reviewed on 5/22/2025

    Dr. Cowley was newly assigned to me. I found her to be extremely helpful in making decisions regarding the problem with my eyes. She was very knowledgeable, and gave me hope for better vision in the future.

    5 out of 5 stars
    Reviewed on 5/8/2025

    Excellent

    5 out of 5 stars
    Reviewed on 5/6/2025

    This was my first visit with Dr. Cowley. I was very impressed with her knowledge of eye issues and her advice for me to be alert to sudden changes I may experience with my vision.

    5 out of 5 stars
    Reviewed on 4/29/2025

    She seemed concerned about my AMD. She was caring and was familiar with my file even before she came in the exam room

    5 out of 5 stars
    Reviewed on 4/29/2025

    She reviewed my medical records before my visit.

    5 out of 5 stars
    Reviewed on 4/28/2025

    Very competent

    5 out of 5 stars
    Reviewed on 4/24/2025

    Very knowledgeable and easy to talk to

    5 out of 5 stars
    Reviewed on 4/24/2025

    Dr Cowley was amazing! So thoughtful and caring!

    5 out of 5 stars
    Reviewed on 4/24/2025

    The only place to go for eye issues

    5 out of 5 stars
    Reviewed on 4/22/2025

    Outstanding

    3 out of 5 stars
    Reviewed on 4/18/2025

    Dr COWLEY was efficient but hurried. When I asked questions she almost seemed annoyed. She lacked any interest in myself as a person, I was a diagnosis to be ticked off her to do list.Although she was professional.

    5 out of 5 stars
    Reviewed on 4/18/2025

    Super good.

    5 out of 5 stars
    Reviewed on 4/18/2025

    Dr. Cowley was very knowledgeable & provided some valuable Instructions about the care of my eyes. She also was very skillful with the eye injection. Thank you.

    2 out of 5 stars
    Reviewed on 4/15/2025

    This was my 1st visit with this provider. Not at all impressed. Will be looking for a new retina specialist. Was very dissatisfied!