
Marianne Cowley, MD
Retina and Vitreous Diseases
Highlights
Age Groups Seen
- Young Adult 18-25
- Adult 26-64
- Older Adult 65+
Languages
- English
In-Network Plans
View All Accepted Plans (12)Gender
FemaleJohns Hopkins Affiliations:
- Johns Hopkins School of Medicine
About Marianne Cowley
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
- Johns Hopkins Health Care Center - Odenton
- 1106 Annapolis Road, Suite 290, Odenton, MD 21113
- Get Directions
- phone: 410-874-1425
- fax: 410-874-1429
- The Johns Hopkins Hospital
- 1800 Orleans Street, Maumenee Lobby, Baltimore, MD 21287
- Get Directions
- phone: 410-955-5080
- fax: 410-955-0869
- Johns Hopkins Health Care & Surgery Center - Green Spring Station, Lutherville
- 10753 Falls Road, Pavilion II STE 455, Lutherville, MD 21093
- Get Directions
- phone: 410-583-2800
- fax: 410-583-2842
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
- 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 reviewsThe 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.
- 5 out of 5 starsReviewed on 3/23/2026
Outstanding doctor
- 5 out of 5 starsReviewed on 3/17/2026
Very knowledgeable and explained info thoroughly
- 5 out of 5 starsReviewed on 3/17/2026
Excellent
- 3 out of 5 starsReviewed 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 starsReviewed on 3/10/2026
Dr. Cowley is definitely worth any wait.
- 5 out of 5 starsReviewed on 3/10/2026
Very careful and thorough.
- 5 out of 5 starsReviewed on 3/9/2026
All good
- 5 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed on 2/23/2026
Excellent
- 5 out of 5 starsReviewed on 2/16/2026
Professional, knowledgeable and patient.
- 5 out of 5 starsReviewed on 2/10/2026
Felt very comfortable with providervisit
- 5 out of 5 starsReviewed 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 starsReviewed on 2/10/2026
Dr. Cowley did a great job!
- 5 out of 5 starsReviewed on 2/10/2026
Everything was easy to foiiow and understand
- 5 out of 5 starsReviewed on 2/9/2026
Dr Cowley is a knowledgable and caring doctor.
- 5 out of 5 starsReviewed 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 starsReviewed on 2/3/2026
I feel very confident in my provider and believe I am receiving the best treatment possible.
- 5 out of 5 starsReviewed on 2/3/2026
Dr Cowley is always very thorough and works to coordinate my care with [staff]
- 5 out of 5 starsReviewed on 1/30/2026
Dr Cowley listened to my concerns and advised me what to do for my AMD.
- 5 out of 5 starsReviewed on 1/30/2026
I trust her experience. She is deliberate and careful.
- 5 out of 5 starsReviewed on 1/30/2026
She was very caring
- 5 out of 5 starsReviewed on 1/27/2026
This provider always make sure that I will get an interpreter.
- 5 out of 5 starsReviewed 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 starsReviewed on 1/20/2026
She is fantastic
- 5 out of 5 starsReviewed on 1/20/2026
Dr. Cowley excellent care , treatment and service .
- 5 out of 5 starsReviewed on 1/12/2026
Very knowledgeable. A very good experience
- 5 out of 5 starsReviewed on 1/8/2026
Excellent!
- 5 out of 5 starsReviewed on 1/8/2026
Very nice and concerned about my condition
- 5 out of 5 starsReviewed on 1/8/2026
Very knowledgeable
- 5 out of 5 starsReviewed on 1/6/2026
Dr. Cowley is an excellent doctor in her field.
- 5 out of 5 starsReviewed on 1/6/2026
Good
- 5 out of 5 starsReviewed on 1/5/2026
I enjoy coming here. They take real good care of me in my eyes.
- 5 out of 5 starsReviewed on 1/5/2026
Great
- 5 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed on 12/23/2025
I have great confidence in her.
- 5 out of 5 starsReviewed on 12/16/2025
Professional and knowledgeable
- 5 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed on 12/11/2025
Everyone was polite and did a good job
- 5 out of 5 starsReviewed on 12/9/2025
Very happy with my eye doctor care
- 4 out of 5 starsReviewed 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 starsReviewed on 12/2/2025
Excellent care and support from Dr Cowley
- 5 out of 5 starsReviewed 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 starsReviewed on 12/2/2025
Provider is excellent!
- 5 out of 5 starsReviewed 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 starsReviewed on 12/1/2025
Exactly the provider I needed to explain my condition and allay my concerns.
- 3 out of 5 starsReviewed on 11/24/2025
She was very short
- 5 out of 5 starsReviewed on 11/24/2025
Very helpful explaining my eye condition and future expectations
- 5 out of 5 starsReviewed on 11/24/2025
Seemed very knowledgeable and nice pleasant person.
- 5 out of 5 starsReviewed on 11/18/2025
She is very knowledgeable about my eyes condition. Very professional and thorough.
- 5 out of 5 starsReviewed on 11/18/2025
Dr. Cowley is very good.
- 5 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed on 11/10/2025
I am very pleased with the care Dr. Cowley has provided me.
- 3 out of 5 starsReviewed 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 starsReviewed on 11/3/2025
Good!
- 5 out of 5 starsReviewed 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 starsReviewed on 10/31/2025
Marianne Cowley is excellent at her job.
- 4 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed on 10/21/2025
One hour late for the appointment!
- 2 out of 5 starsReviewed 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 starsReviewed on 10/20/2025
Not real warm and fuzzy but straightforward
- 5 out of 5 starsReviewed on 10/20/2025
Very professional
- 5 out of 5 starsReviewed on 10/17/2025
1st seeing this doctor I immediately liked her
- 5 out of 5 starsReviewed on 10/14/2025
Great provider
- 5 out of 5 starsReviewed on 10/7/2025
Dr Cowley was amazing. She was very caring, professional and compassionate
- 5 out of 5 starsReviewed on 10/6/2025
Dr. Was very thorough.
- 5 out of 5 starsReviewed 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 starsReviewed on 9/26/2025
LIMITED UNDERSTANDING OF SITUATION. STAND-IN FOR DOCTOR ON LEAVE
- 5 out of 5 starsReviewed on 9/23/2025
She is patient and gives good self care advice
- 4 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed 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 starsReviewed on 9/15/2025
I was very impressed with Dr Cowley, she explained everything to me very clearly
- 5 out of 5 starsReviewed on 9/12/2025
Very clear, matter of fact, responsive listener
- 5 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed on 9/8/2025
Polite, clear, thorough
- 5 out of 5 starsReviewed on 9/2/2025
Great service!
- 5 out of 5 starsReviewed on 8/18/2025
First visit with this doctor and I felt very comfortable with her.
- 5 out of 5 starsReviewed 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 starsReviewed on 8/14/2025
Not enough time examining g me.
- 5 out of 5 starsReviewed on 8/14/2025
Very caring and thorough in explanation of examination findings
- 5 out of 5 starsReviewed on 8/11/2025
She answered my questions and explained things clearly
- 5 out of 5 starsReviewed on 8/5/2025
Excellent care, in depth knowledge and experience.
- 5 out of 5 starsReviewed on 8/4/2025
Dr. Cowley is an excellent caring doctor.
- 5 out of 5 starsReviewed on 7/29/2025
Gave me a good 2nd opinion
- 2 out of 5 starsReviewed on 7/29/2025
The doctor has no concern
- 5 out of 5 starsReviewed on 7/22/2025
Astute, highly experienced, old school practitioner
- 5 out of 5 starsReviewed on 7/15/2025
First visit. Hope Dr. Cowley stays...liked her a lot.
- 5 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed 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 starsReviewed on 7/14/2025
Dr. Cowley is careful and knowledgeable
- 5 out of 5 starsReviewed on 7/14/2025
Top Notch
- 1 out of 5 starsReviewed 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 starsReviewed on 7/1/2025
Dr. Cowley has no pleasant personality.
- 5 out of 5 starsReviewed on 6/24/2025
This center provided excellent care and answered all of my questions and concerns
- 5 out of 5 starsReviewed on 6/17/2025
She was new to me and I was very happy with her expertise.
- 5 out of 5 starsReviewed on 6/17/2025
Very good
- 5 out of 5 starsReviewed on 6/16/2025
Dr Cowley very knowledgeable. She doesn't waste time
- 5 out of 5 starsReviewed on 6/16/2025
Very good
- 5 out of 5 starsReviewed on 6/10/2025
The provider is knowledgeable
- 5 out of 5 starsReviewed on 5/22/2025
Very knowledgeable of my eye situation and helpful
- 5 out of 5 starsReviewed 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 starsReviewed on 5/8/2025
Excellent
- 5 out of 5 starsReviewed 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 starsReviewed 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 starsReviewed on 4/29/2025
She reviewed my medical records before my visit.
- 5 out of 5 starsReviewed on 4/28/2025
Very competent
- 5 out of 5 starsReviewed on 4/24/2025
Very knowledgeable and easy to talk to
- 5 out of 5 starsReviewed on 4/24/2025
Dr Cowley was amazing! So thoughtful and caring!
- 5 out of 5 starsReviewed on 4/24/2025
The only place to go for eye issues
- 5 out of 5 starsReviewed on 4/22/2025
Outstanding
- 3 out of 5 starsReviewed 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 starsReviewed on 4/18/2025
Super good.
- 5 out of 5 starsReviewed 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 starsReviewed 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!