Marianne Cowley, MD
Retina and Vitreous Diseases
Johns Hopkins Wilmer Eye Institute - Frederick
161 Thomas Johnson Drive, Suite 275
Frederick, MD 21113 Directions
4.6 out of 5
394 verified ratings
394 Ratings, 128 Comments
The following ratings and reviews are based on verified feedback collected from independently administered patient experience surveys. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy.
Jun 29, 2026
I've always had a good check up experience-I've seen several different providers over the years!
Jun 29, 2026
Dr. Cowley brings significant value to the Wilmer Eye Institute as the result of her superb knowledge and experience. She is a true treasure and an amzing asset to the Wilmer Eye Institute.
Jun 23, 2026
Excellent
Jun 23, 2026
Dr. Cowley keeps me informed about the progression of my macular degeneration and the necessary steps to check my sight. She always listens to my concerns.
Jun 16, 2026
Dr Cowley is thorough and provides useful information and advice.
Jun 16, 2026
My eye Dr is excellent, very professional and knowledgeable about my eyes .
Jun 16, 2026
She was excellent ! She answers all questions and never rushes you.She is super informative & I am very comfortable with Dr Cowley!
Jun 15, 2026
Excellent
Jun 9, 2026
Best ever. Excellent care.
Jun 8, 2026
This was my first interaction Johns Hopkins healthcare. I felt comfortable with the visit; and was well respected and well cared for.
Jun 8, 2026
Dr Cowley is just the best, most competent and communicative doctor. I have complete confidence in her.
Jun 8, 2026
Awesome professional caring knowledgeable patient and kind
Jun 8, 2026
Excellent
Jun 2, 2026
She gets right down to business and takes a caitious approach to my condition.
Jun 1, 2026
She focused on improving my vision.
Jun 1, 2026
Very knowledgeable
Jun 1, 2026
Dr. Cowley is extremely wise and thorough! I feel blessed to have her!
Jun 1, 2026
My provider listens intently and takes my concerns seriously
May 26, 2026
Dr. Cowley was thorough, answered my questions, and made me feel more hopeful.
May 19, 2026
Dr Cowley is very thorough, takes time with me and follows up
May 18, 2026
My provider Dr. Cowley is great and I don't have anything negative to say about her. She is very straight to the point and I appreciate that.
May 14, 2026
Dr Cowley is a real human doctor. Most respectful of patient Caring and knowlegeable. Trust worthy
May 14, 2026
Professional and Courteous
May 12, 2026
Dr Cowley has been immensely helpful in treating my eyes and explaining the plan and follow-up I highly recommend her to anyone needing a specialist!
May 12, 2026
Keep up the good job
May 11, 2026
Knowledgeable and professional
May 5, 2026
I. I could not ask for a better doctor!!! I am so pleased!!!
May 5, 2026
She is outstanding
May 5, 2026
I feel that she is the provider I could possibly have!!!
May 5, 2026
Since I am deaf, they provided VRI device (Video Remote Interpretation Services) which they understood how to use it well.
May 4, 2026
Very good
Apr 28, 2026
Truly outstanding and caring. Ordered up certain tests and all was accomplished.
Apr 27, 2026
Care us excellent
Apr 27, 2026
Always the same, knowledgeable, professional, Kind respectful and understanding.Very good in her profession
Apr 27, 2026
Very pleasant and thorough,
Apr 21, 2026
Very professional. Explained the exact nature of my problem and what I should do to improve my connection.
Apr 21, 2026
Top notch professional. Very efficient.
Apr 20, 2026
She is respectful, caring, listens well and explains things clearly
Apr 20, 2026
Very knowledgeable about my condition and told me what to look out for if it happens again.
Apr 20, 2026
I continue to have top confidence about the treatment I receive
Apr 14, 2026
My doctor seems like she knows what she is doing.
Apr 6, 2026
Dr. Cowley is an excellent provider.
Apr 6, 2026
Kind, comprehensive and well informed.
Mar 30, 2026
Professional, thorough, caring.
Mar 30, 2026
Very professional
Mar 26, 2026
Very professional and nice to work with
Mar 24, 2026
Dr Cowley is very knowledgeable and professional. She understands my eye condition and is an awesome Dr
Mar 24, 2026
Johns Hopkins is a great healthcare facility
Mar 23, 2026
Outstanding doctor
Mar 23, 2026
My provider is incredibly friendly and takes the time to explain everything in a clear, understandable way. She really makes you feel at ease and comfortable throughout the visit.