Highlights
Age Groups Seen
- Adult
Languages
- English
Gender
MaleLocations
- i Building - Cole Eye Institute
- 2022 East 105th Street, Cleveland, OH 44106
- Get Directions
- Lorain Family Health and Surgery Center
- 5700 Cooper Foster Park Road West, Lorain, OH 44053
- Get Directions
- Independence Family Health Center
- 5001 Rockside Road, Independence, OH 44131
- Get Directions
- Westlake Medical Campus Building A
- 850 Columbia Road, Westlake, OH 44145
- Get Directions
Education & Board Certifications
Education
- Fellowship: Cleveland Clinic, 2022
- Residency: University of Minnesota, 2020
- Internship: Oakwood Hospital and Medical Center, 2017
- Medical Education: Oakland University- William Beaumount Hospital , 2016
- Undergraduate: Duke University School of Medicine, 2011
Board Certifications
- Ophthalmology: American Board of Ophthalmology, 2021
Awards
- Faculty Clinical Teacher of the Year, Cole Eye Institute Retina, 2024
- Heed Fellowship Award, Heed Ophthalmic Foundation, 2021
- Fellow Teacher of the Year, Cole Eye Institute, 2022
- Fellow Research Award, Cole Eye Institute, 2022
- American Uveitis Society Travel Grant Awardee, 2022
- Vit-Buckle Society Travel Grant Awardee, 2022
- American Society of Retina Specialists Fellow Grand Rounds Winner, 2021-2022
- American Academy of Ophthalmology Best Original Paper, 2019
- Polande Finke Chair Resident Award, University of Minnesota, 2019
- Richard T. Olson Best Resident Teaching Award, University of Minnesota, 2019
- Gail Summers Award, University of Minnesota, 2019
Research & Publications
See publications for this provider. (Disclaimer: This search is powered by PubMed, a service of the U.S. National Library of Medicine. PubMed is a third-party website with no affiliation with Cleveland Clinic.)
Industry Relationships
Cleveland Clinic physicians and scientists collaborate with industry to advance medical breakthroughs. These partnerships help commercialize discoveries for public benefit while maintaining scientific integrity. To ensure transparency and minimize potential bias, Cleveland Clinic reviews these relationships and publicly discloses when physicians/scientists receive significant compensation for consulting, serve in fiduciary roles, receive royalties, or hold equity interests related to their work. We manage potential conflicts through approval processes, annual reporting, and targeted management plans.
As of 2026-03-23, Dr. Mammo has reported the financial relationships with the companies listed below.
Consulting and/or Speaking. Dr. Mammo receives fees of $5,000 or more per year (or, in rare cases, equity or stock options) as a paid consultant, speaker or as a member of an advisory committee for the following companies:
- Genentech, Inc
- Apellis Pharmaceuticals, Inc.
- Ani Pharmaceuticals, Inc.
- Bausch and Lomb
Public Health Service-Reportable Financial Conflicts of Interest. Cleveland Clinic scientists and physicians engage in basic, translational and clinical research activities, working to solve health problems, enhance patient care and improve quality of life for patients. Interactions with industry are essential to bringing the researchers' discoveries to the public, but can present the potential for conflicts of interest related to their research activities. Click here to view a listing of instances where Cleveland Clinic has identified a Public Health Service (PHS)-Reportable Financial Conflict of Interest and has put measures in place to ensure that, to the extent possible, the design, conduct and reporting of the research is free from bias.
* Cleveland Clinic physicians and scientists subscribe to the guidance presented in the PhRMA Code on Interactions with Healthcare Professionals and the AdvaMed Code of Ethics on Interactions with Health Care Professionals. As such, gifts of substantial value are generally prohibited.
Insurances Accepted
Ratings & Reviews
4.9 out of 5
690 ratings, 104 reviewsThe Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.
- 5 out of 5 starsReviewed on 4/15/2026
All staff and people at the check-in are very professional, and Dr. Mammo''s staff are very, very professional.
- 5 out of 5 starsReviewed on 4/13/2026
Dr. Mammo is always very kind, patient with my questions, and timely.
- 5 out of 5 starsReviewed on 4/6/2026
Love my care at Clinic better than any other health provider
- 5 out of 5 starsReviewed on 4/6/2026
Very confident in Dr. Mammo.
- 5 out of 5 starsReviewed on 4/6/2026
Very well staffed office Dr. Mammo is a very professional and personable person. He is good at explaining things well. We miss Dr. TRABOLUSI at main campus but are very happy with Dr. MAMMO.
- 5 out of 5 starsReviewed on 4/6/2026
Dr Mammo is one of the most concerned, Knowledgeableand professional people Who has cared for me at Cleveland Clinic
- 5 out of 5 starsReviewed on 4/6/2026
Always very good service from the people who work for Dr Mammo
- 5 out of 5 starsReviewed on 4/6/2026
Dr Mammo is excellent and has helped me tremendously.
- 5 out of 5 starsReviewed on 3/24/2026
Dr. Mammo earned my trust and respect through his professionalism and respect he gives the patient. He is an excellent physician who takes an interest in the care of the individual he is treating.
- 5 out of 5 starsReviewed on 3/24/2026
Highly recommend Dr. Mammo. Very pleased with my results.
- 5 out of 5 starsReviewed on 3/16/2026
Dr. Mammo is wonderful!
- 5 out of 5 starsReviewed on 3/6/2026
The doctor answered my questions very clearly
- 5 out of 5 starsReviewed on 2/27/2026
The Dr. And staff are outstanding
- 5 out of 5 starsReviewed on 2/20/2026
I was very pleased with my visit with dr. Mammo. He explained everything that was going on with my eye and how he was going to treat it. The eye infection was fast and painless. I couldn''t be more pleased with his care. Excellent doctor.
- 5 out of 5 starsReviewed on 2/20/2026
I can''t say enough good things about Dr. Danny Mammo, who has provided my retinal care and monitoring for the last 3-4 years. He''s competent, personable, and knows me as a person and a patient. I wasn''t just a number coming through the door.
- 5 out of 5 starsReviewed on 2/20/2026
Dr. Mammo Is very kind and respectful. He explains everything
- 5 out of 5 starsReviewed on 2/16/2026
I have in the past recommended Dr Mammo along with the Cleveland clinic Cole eye institute to my parents.
- 5 out of 5 starsReviewed on 2/5/2026
Dr Mammo is a professional who is trying to save my eye sight
- 5 out of 5 starsReviewed on 2/5/2026
Dr Mammo and I had previously discussed surgery as an option. It was an easy discussion once I decided to proceed.
- 5 out of 5 starsReviewed on 1/29/2026
Dr. Mammo was very thorough with exam and explained everything in detail so I was able to understand my condition.
- 5 out of 5 starsReviewed on 1/29/2026
Dr. Mammo has all the qualities of a competent and caring physician.
- 5 out of 5 starsReviewed on 1/27/2026
Dr. Mammo is wonderful!
- 5 out of 5 starsReviewed on 1/27/2026
I love Dr . Mammo
- 5 out of 5 starsReviewed on 1/14/2026
We love Dr. Mammo. He is superior in his area of medical practice.
- 5 out of 5 starsReviewed on 12/29/2025
Excellent Doctor
- 5 out of 5 starsReviewed on 12/29/2025
This is an amazing staff. The service in this office is wonderful. Everyone here here is friendly and professional. Dr. Mammo's resident was even gentler than Dr Mammo
- 5 out of 5 starsReviewed on 12/9/2025
My first appointment with Dr Mammo was somewhat anxious for me since I assumed I would need eye shots. To my excitement, he recommended laser treatment. Dr Mammo always takes the time to review treatment options and results to date. He is trustworthy and considerate and always answers my questions to my level of understanding. I'm thrilled to say my vision and eye health has been restored to optimum level for my age and condition.I STRONGLY recommend Dr Mammo if you are looking for a Retinologist and want fantastic service and results.
- 5 out of 5 starsReviewed on 12/8/2025
Doctor Mammo was fantastic as usual. He has an aurora of confidence that puts you at ease.
- 5 out of 5 starsReviewed on 12/8/2025
Dr. Mammo and his team are always courteous, prompt, conscientious, considerate (shall I continue?). Even wear a mask for me.
- 5 out of 5 starsReviewed on 12/8/2025
Dr. Mammo is supurb- he has performed major miracles in restoring my vision!
- 5 out of 5 starsReviewed on 12/2/2025
Very satisfied by the care I received from Dr. Mammo
- 5 out of 5 starsReviewed on 12/2/2025
I was very nervous about my appointment with Dr. Mammo for some retina issues but he was absolutely. AWESOME He listens, he addresses any concerns, he is compassionate.I am so ecstatic and relieved that Dr. Mammo will be following my retina issues from this day forward.
- 5 out of 5 starsReviewed on 11/21/2025
Great Doctor
- 5 out of 5 starsReviewed on 11/21/2025
Dr Mammo did a great job explaining my progress and how I will be treated going forward
- 5 out of 5 starsReviewed on 11/21/2025
Great Doctor!!
- 5 out of 5 starsReviewed on 11/21/2025
I have already recommended Dr Mammo to many of my friends. He is outstanding!
- 5 out of 5 starsReviewed on 11/21/2025
Dr.Mammo is a wonderful doctor! I can't say enough about him, but I sure do try. I recommend him now, and I always will. Dr. Mammo, and his, nurse, an entire team has been good to me from day one. I am so very thankful for him.
- 5 out of 5 starsReviewed on 11/13/2025
We love love live Dr. Mamo
- 5 out of 5 starsReviewed on 11/13/2025
Dr Mammo explains everything clearly and involves me in decisions concerning my eye treatment. He also patiently answers questions.
- 5 out of 5 starsReviewed on 11/10/2025
Dr Mammo is excellent
- 5 out of 5 starsReviewed on 11/4/2025
I feel highly confident in the care I get from Dr Mammo.
- 5 out of 5 starsReviewed on 10/23/2025
Very satisfied with the care I got at the Ophthalmology department in Independence by Dr. Grosel particularly thankful to the surgeon Dr. Mammo
- 5 out of 5 starsReviewed on 10/23/2025
Doctor was very good at explaining my condition.
- 5 out of 5 starsReviewed on 10/23/2025
Would recommend Dr. Mammo to anyone that needed eye surgery. Never felt rushed. He was very reassuring.
- 5 out of 5 starsReviewed on 10/23/2025
I would definitely recommend the Cole eye Institute and Dr. Mammo
- 5 out of 5 starsReviewed on 10/16/2025
You still need to give e e excellent as an option. Dr Mammo is amazing and he is respected and well liked by his staff, too
- 5 out of 5 starsReviewed on 10/16/2025
I feel save with this doctor, he is so intelligent, kind and I feel safe. Fabulous Doctor
- 5 out of 5 starsReviewed on 10/16/2025
Dr.Mammo is amazzing
- 5 out of 5 starsReviewed on 10/8/2025
Dr Manao saveing my eyes! Thank you
- 5 out of 5 starsReviewed on 10/8/2025
Excellent physician. Really listens.
- 5 out of 5 starsReviewed on 10/8/2025
Dr Mammo and his assistants our the best
- 5 out of 5 starsReviewed on 9/24/2025
Never had a poor or bad experience with Cleveland Clinic or Dr. Mammo
- 5 out of 5 starsReviewed on 9/24/2025
Dr. Mammo is absolutely wonderful. He answers all questions and provides care with compassion and empathy.
- 5 out of 5 starsReviewed on 9/24/2025
Dr Mammo is an example of how doctors should be. He Is Knowledgeable and very optimistic. I am privileged to be his patient.
- 5 out of 5 starsReviewed on 9/23/2025
Dr. Mammo is excellent in all aspects.
- 5 out of 5 starsReviewed on 9/23/2025
Dr. DM needs to work on the appropriate and professional tone of his emails to his patients.
- 5 out of 5 starsReviewed on 9/23/2025
Office and Dr mammo is always courteous
- 5 out of 5 starsReviewed on 9/23/2025
Dr Mammo has been so extremely kind & considerate with answering and & all of my concerns and/or questions! I never leave feeling I still have things I am unsure about. I always leave his office with confidence he covered everything I needed.
- 5 out of 5 starsReviewed on 9/23/2025
Excellent doctor!
- 5 out of 5 starsReviewed on 9/12/2025
Dr. Mammo is truly an amazing doctor.
- 5 out of 5 starsReviewed on 9/12/2025
Dr. Mammo is so caring as a human being never hurried me explains every detail. Makes me feel not afraid to ask questions . That means so much to me because he gives me hope at this time in my life.
- 5 out of 5 starsReviewed on 9/12/2025
Dr. Mammo is very good about considering the best overall treatment for me, with the least amount of negative side effects while also being effective against the disease
- 5 out of 5 starsReviewed on 9/10/2025
DR Mammo is the best
- 5 out of 5 starsReviewed on 8/19/2025
Dr Mammo is an excellent doctor. I would recommend him to anyone who has concerns about their eyes
- 5 out of 5 starsReviewed on 8/19/2025
Dr Mammo and his assistants are very caring
- 5 out of 5 starsReviewed on 8/19/2025
Dr Mammo is an excellent doctor. Friendly, caring, knowledgeable. There is no rush, answers questions thoroughly.
- 5 out of 5 starsReviewed on 8/12/2025
Dr. Mammo is just incredible, he helping me with my sight.
- 5 out of 5 starsReviewed on 8/4/2025
Dr mamao very professional at what he does
- 5 out of 5 starsReviewed on 7/29/2025
Dr. Mammo is the best. He really inspires confidence in his abilities. Glad he's on my team!!!
- 5 out of 5 starsReviewed on 7/22/2025
I think Dr. Mammas is a wonderful man and an excellent doctor. I would and have recommended him to others and always will. Even though I didn't get the outcome I wanted, I know he did the very best he could for me, an I appreciate everything he did for me. He is an awesome retina specialist.
- 5 out of 5 starsReviewed on 7/22/2025
Treated me great. It was fast I didn't have to wait long. My sister was with me and they treated her good too. The doctor explained to me and I am scared but he said I'll take good care of you . He was great!! So was the staff. Thank you!!
- 4 out of 5 starsReviewed on 7/22/2025
Provider appeared very arrogant
- 5 out of 5 starsReviewed on 7/22/2025
A very good doctor that has the patient in mind. Tells you like it is. Doesn't sugar coat it
- 5 out of 5 starsReviewed on 7/15/2025
Dr. Mammo is professional and respectful. He greets me by my name and I trust my care in his expertise. Excellent physician.
- 5 out of 5 starsReviewed on 7/15/2025
Excellent doctor. So thankful for him.
- 5 out of 5 starsReviewed on 7/15/2025
Dr. Mammo is clear about the treatments and what steps need to be taken for a serious eye condition. I appreciate the time he takes with me at each visit.
- 5 out of 5 starsReviewed on 7/15/2025
He Is a good doctor concerned about his patients.
- 5 out of 5 starsReviewed on 7/15/2025
Dr. Mammo and his assistant always respond promptly to any type of communication. I appreciate the ability to communicate through My Chart email as I am living in Japan for part of the year.
- 5 out of 5 starsReviewed on 7/2/2025
Dr Mammo was professional and straightforward. He answered my questions honestly in terms I could understand.
- 5 out of 5 starsReviewed on 7/2/2025
Very impressed with Dr Mammo. Very knowledgeable. Has a great career ahead of him. Best retinal specialist I have ever had.
- 5 out of 5 starsReviewed on 7/2/2025
Awesome experience with Doctor
- 5 out of 5 starsReviewed on 7/1/2025
Dr was very reassuring. And helpful. Listen to what I had to say
- 5 out of 5 starsReviewed on 7/1/2025
I'm so impressed with Dr. Mammo and his nurses. I have complete confidence that he will take care of a scary problem that I have with my retina. He has a wonderful manner, and talks you through difficult things like injections and laser surgery. I never thought I could maintain composure through such experiences, and he helps me do it. I also have confidence in his judgment, so I know that if he tells me something I can trust him.
- 5 out of 5 starsReviewed on 7/1/2025
Dr Mammo is One of Cleveland Clinic Best Assets He is So Kind his Compassion and Knowledge is Remarkable I tell all my clients about him I would follow him wherever he would go!
- 5 out of 5 starsReviewed on 7/1/2025
Having knowledge in the medical field and being a D.V.M my helped with Dr. Mammo. I would recommend him to anyone requiring eye surgery. His skill is exceptional.
- 5 out of 5 starsReviewed on 6/23/2025
Dr. Mammo answered all of my questions. He explained what is happening with my retina. His manner was very approachable and informative.
- 5 out of 5 starsReviewed on 6/10/2025
Top notch physician
- 5 out of 5 starsReviewed on 6/10/2025
He's a fantastic Dr.!
- 5 out of 5 starsReviewed on 6/10/2025
I appreciate Dr Mammo's staff's help in coordinating my appointment with those of my husband's and in helping manage the 6 hour round trip from our home to the Clinic.
- 5 out of 5 starsReviewed on 5/29/2025
Dr. Mammo and his team gave me such wonderful, immediate emergency care. I am so glad that Dr. Mammo was available to see me on such short notice. He and his team are the best!
- 5 out of 5 starsReviewed on 5/29/2025
Dr Mammo is excellent. He talks to you, explains the treatment, and answers questions.
- 5 out of 5 starsReviewed on 5/22/2025
Dr. Mammo is a consummate professional--and overall kind and lovely man!
- 5 out of 5 starsReviewed on 5/22/2025
I was blessed to be assigned to Dr. Mammo his first day on site. I have followed him over to independence for his compassionate care that he provides as well as thorough diagnostics and even though he is only allotted a short amount of time he makes it seem like a Quality visit ,and he aways answers any questions. Thank you Dr. Mammo .
- 5 out of 5 starsReviewed on 5/19/2025
Dr. Mammo and his assistants were helpful and pleasant to work with! They explained what they were going to do!
- 5 out of 5 starsReviewed on 5/19/2025
I have been a patient with Cole for many years, I just switched to the Cole in Westlake since Dr Babich office moved. I saw Dr Mammo and he was wonderful as was the entire staff. Very organized!!
- 5 out of 5 starsReviewed on 5/19/2025
Dr. Mammo is wonderful. He is kind knowledgable, compassionate and dedicated. I also saw the Resident Dr. Butter who was very good as well
- 5 out of 5 starsReviewed on 5/12/2025
DR. MOMMO IS AMAZING & HIS STAFF AS WELL.
- 5 out of 5 starsReviewed on 5/4/2025
Dr Mammo and his staff are excellent. He and his staff have exceptional bedside manners and explain everything clearly. This is an extremely difficult appointment for me as I get overly anxious - he is knowledgeable, competent and efficient. I will recommend him to otherssomething I do only when the care is A+. Cleveland clinic needs more like him.
- 5 out of 5 starsReviewed on 5/4/2025
Dr Mammo talked me into getting a needed injection and I couldn't be happier about it! 10/10, would do it again!
- 5 out of 5 starsReviewed on 4/29/2025
Dr Mammo is a rare breed, he's direct and to the point. He reminds me of the Lion on the seregetti. He gives you his full attention. Great Dr.
- 5 out of 5 starsReviewed on 4/25/2025
Dr Manno and his staff always makes me feel comfortable and explains all the procedures.
- 5 out of 5 starsReviewed on 4/25/2025
Have already referred Dr. Mammo to a family member.
- 5 out of 5 starsReviewed on 4/25/2025
Dr. Mammo was very courteous and was knowledgeable about the background of my eye conditions and suggested continuing to monitor my status which I appreciate.
- 5 out of 5 starsReviewed on 4/25/2025
I already have recommended Dr.Mammo.