Education:
1982 | Istanbul University Cerrahpaşa Faculty of Medicine |
1984 | Istanbul University Cerrahpaşa Faculty of Medicine Ophthalmology Specialization Training |
1994 | Istanbul University Cerrahpaşa Faculty of Medicine Ophthalmology \ Associate Professor |
2000 | Istanbul University Cerrahpaşa Faculty of Medicine Ophthalmology \ Professor |
Dr. Duygu Tez is an experienced ophthalmologist. She specializes in cataract surgery, LASIK eye surgery, and laser iridotomy. She has published research in both international and national journals. Her work has helped improve knowledge and practice in ophthalmology.
Dr. Tez graduated from Ankara University Faculty of Medicine. She completed her ophthalmology training at Gülhane Military Medical Academy in 1984. She has also received advanced training in retina, cornea, and oculoplastic procedures. Dr. Tez is a member of the Turkish Ophthalmology Association. She is known for her careful approach to eye care and successful surgical results.
ULUOCAK N., PARLAKTAS BS., DENİZ FE, ERDEMİR F., KOSEOGLU RD., GEDAR OM. ORBITAL METASTASIS OF PROSTATE CANCER: A CASE REPORT. KAOHSIUNG J MED SCI. 2007;23:199–202.
Gedar (Totuk) OM, ARI DE, AYKAN Ü. Anesthetıc Management in Glaucoma Surgery. ARC Journal of Anesthesiology Volume 1, Issue 3, 2016, PP 9-18
ISSN No. 2455-9792 (Online) http://dx.doi.org/10.20431/2455-9792.0103002
www.arcjournals.org.
International Reports
TOYGAR B, GORGUN E, GEDAR M, COSKUNSEVEN E, ARSLAN E.REFRACTIVE LENS EXCHANGE WITH THE DIFFRACTIVE TECNIS MULTIFOCAL IOL: LONG-TERM FOLLOW-UP. XXIV CONGRESS OF THE ESCRS. 9-13 SEPTEMBER 2006, LONDON. FREE PAPER. ABSTRACT BOOK P.151-152.
TOYGAR B, GORGUN E, COSKUNSEVEN E, ARSLAN E, GEDAR M. TORIC PHAKIC INTRAOCULAR LENS IMPLANTATION: LONG-TERM RESULTS. XXIV CONGRESS OF THE ESCRS. 9-13 SEPTEMBER 2006, LONDON. FREE PAPER. ABSTRACT BOOK P.152.
GEDAR M, TOYGAR B, COSKUNSEVEN E, ARSLAN E. COMPARISON OF FLAP THICKNESS ACCURACY USING HANSATOME® XP MICROKERATOME AND INTRALASE FEMTOSECOND FS2 AND FS30 LASERS FOR LASIK. XXIV CONGRESS OF THE ESCRS. 9-13 SEPTEMBER 2006, LONDON
DRY EYE, TREATMENTS. SEEOS 5TH CONGRESS. CRCRS – 4TH OPHTHALMOLOGİC SCHOOL – 16-18 MAY 2008. INVITED SPEAKER.
TRANSCANALICULAR ENDOSCOPIC DCR. SEEOS & BSOS CONGRESS- 19-22 MAY 2011. INVITED SPEAKER.
EARLY EXPERIENCE WITH A NEW DIFFRACTIVE REFRACTIVE MULTIFOCAL IOL. TOYGAR B, YABASKIZILOGLU O, TOYGAR O, HACIMUSTAFAOGLU AM, GEDAR OM. ASCRS•ASOA SYMPOSİUM & CONGRESS MAY 6-10, 2016.
Dr. Zeynep Alkin is a Professor of Ophthalmology. She specializes in medical retina and vitreoretinal surgery. She earned her medical degree at Istanbul University. She completed her residency at Beyoglu Eye Training and Research Hospital. Dr. Alkin later served as an Assistant Professor and Clinical Fellow in retina departments. She also completed a research fellowship at Doheny Eye Institute, USC. She is a member of the Turkish Ophthalmological Society and its Medical and Surgical Retina Boards.
Dr. Alkin has given over 40 presentations at national and international meetings. She has authored more than 40 peer-reviewed publications. Her main interests are retinal diseases, diabetic macular edema, and age-related macular degeneration. Her research includes multicenter studies and real-world data analyses. Dr. Alkin’s work supports evidence-based practice in ophthalmology.
Oltre 900 trattamenti per lo strabismo eseguiti – Il Dr. Sönmezer è specializzato in oftalmologia con oltre 30 anni di esperienza.
Dr. Peykan Türkçüoğlu is a professor of ophthalmology. He graduated from Hacettepe University School of Medicine in Turkey. He has served in academic and clinical roles at top institutions. He worked as an assistant and associate professor at Fırat and İnönü Universities.
He completed a fellowship at Johns Hopkins Hospital, Wilmer Eye Institute. There, he specialized in vitreoretinal and medical retinal diseases. Dr. Türkçüoğlu has advanced retinal care and now practices at Veni Vidi Göz Eye Hospital. He is known for his academic work, international training, and leadership in eye surgery and research.
Prof. Yusuf Yıldırım, M.D.
Ophthalmology
Born in Trabzon in 1982, Prof. Yusuf Yıldırım completed his high school education at Kanuni Anatolian High School and earned his medical degree from Istanbul University Faculty of Medicine in 2006. He pursued his residency at Beyoğlu Eye Training and Research Hospital, where he contributed to clinical trials on age-related macular degeneration and myopia treatment. Prof. Yıldırım's clinical focus lies in cataract and refractive surgeries, as well as corneal and ocular surface diseases. He has performed over 10,000 cataract surgeries, numerous ocular surface reconstructions, and advanced corneal transplants (PK, DALK, DMEK). His refractive surgery experience includes PRK, LASIK (mechanical and femtosecond), SMILE, and phakic IOL implantation. He continues to participate in clinical research, particularly involving toric phakic IOLs. He holds multiple distinguished certifications and memberships including FEBO (2016), FICO (2018), a Corneal Subspecialty Diploma (2019), and Membership of the Royal College of Surgeons of Edinburgh (2020). In his academic career, Prof. Yıldırım has contributed to the education of numerous residents and has published widely in the field.
Dr. Ali Riza Cenk Celebi is a Professor of Ophthalmology at Acibadem University (2023–2025). He practices at Acibadem Maslak Hospital (2024–2025). He completed a glaucoma fellowship at Harvard/Mass Eye and Ear in 2016. His clinical work covers glaucoma (MIGS, seton procedures), cornea (limbal stem cell surgery), lacrimal surgery (scarless endoscopic DCR), medical retina (intravitreal injections), myopia control in children, and orbital surgery.
He earned his MD from Hacettepe University and ranked 3rd in his class. He began his ophthalmology residency after placing 11th in Turkey’s TUS exam. Certifications include ICO Basic and Clinical (2010), FEBO (2015), Turkish Board (2016), Advanced ICO/FICO (2017), and USMLE Step 4. His awards include Acibadem Academic Achievement (2015–2023), Best Presentation (2022), and TOD awards (2022–2023). He has published 58 international articles and 15 books. He holds an MSc in Biological Data Science (GPA 3.94/4.00, top of term) and completed training in AI in Healthcare in 2020.
Dr. Nihat Karakaya is an experienced ophthalmologist. He specializes in cataract and refractive surgery. He is skilled in advanced procedures, including retinal detachment surgery, cataract surgery with intraocular lens (IOL) replacement, and LASIK eye surgery.
He is a member of the American Academy of Ophthalmology and the Turkish Ophthalmology Association. Dr. Karakaya regularly attends international congresses and seminars to stay current in his field. He has performed thousands of surgeries with high patient satisfaction and strong clinical results.
2005 – Akdeniz University, Faculty of Medicine, Medical Education
2011 – Istanbul Göztepe Training and Research Hospital, Ophthalmology Specialization
Specialization Thesis: Our Grid Laser Results in the Treatment of Diabetic Macular Edema
Erzincan State Hospital
Mengücek Gazi Training and Research Hospital
Gebze Fatih State Hospital
Tuzla State Hospital
56th TOD National Congress
ESCRS (The European Society of Cataract and Refractive Surgeons)
7th TOD Live Surgery Symposium
Cataract and Refractive Surgery Skills Transfer Course
Cataract and Refractive Surgery Live Applications
-Turkish Ophthalmology Association
-Turkish Medical Association, Istanbul Chamber
Over 10.000 surgical cases.
Certificates
Birth place and date
Konya, 1984
Foreign Languages Known
English, German
Educational Status and Experience
Kayseri City Hospital, Kayseri, Associate Professor (2023)
St. Franziskus-Hospital, Zentrum für Refraktive Chirurgie
Germany, Cornea and Refractive Surgery Fellowship (2022-2023)
Kayseri City Hospital, Kayseri, Specialist Doctor (2018-2022)
Hatice-Muammer Kocatürk State Hospital, Kayseri, Specialist Doctor (2017-2018)
Gazi Yaşargil Training and Research Hospital, Diyarbakır, Specialist Doctor (2014-2017)
Bülent Ecevit University Faculty of Medicine, Zonguldak, Specialization in Medicine (2010-2014)
Abant İzzet Baysal University Faculty of Medicine, Bolu, Medical Education (2007-2010)
GATA Gülhane Military Medical Faculty, Ankara, Medical Education (2003-2007)
Kuleli Military High School, Istanbul (1999-2003)
Case Experience
Experience of over 10,000 surgical cases.
Associations of which he is a member
ESOPRS (European Society Of Ophthalmic Plastic And Reconstructive Surgery), Member, 2022
ESCRS (European Society of Cataract and Refractive Surgeons), Member, 2021
MRCSEd (The Royal College of Surgeons of Edinburgh), Member, 2021
TOD-GO (Turkish Ophthalmology Association - Young Ophthalmologists Group), Member, 2018
TOD (Turkish Ophthalmology Association), Member, 2010
Certificates
2016 European Board of Ophthalmology Diploma, FEBO, Paris
2019 International Council of Ophthalmology (ICO), Visual Sciences
2020 International Council of Ophthalmology (ICO), Optics and Refraction
2020 International Council of Ophthalmology (ICO), Clinical Science
2021 International Council of Ophthalmology (ICO), Advanced Examination, FICO
2019 Ophthalmology Clinical Research Training, Istanbul
2014 Communication, Anterior Segment and Toric Lens Applications, Prague
Books
Sea Sword
MCQ for International Ophthalmology Board Exams – 2
Chapter 4, Oculoplasty, (2021). Anatolian Bookstore.
Awards
FICO, International Fellowship Scholarship 2022
TÜBİTAK, International Scientific Publications Incentive Scholarship UBYT, 2022
TÜBİTAK, International Scientific Publications Incentive Scholarship UBYT, 2020
Ministry of Health, Certificate of Appreciation, 2018
Dr. Mehmet Orçun Akdemir is a member of the Turkish Ophthalmology Association. He has published 24 articles in international peer‑reviewed journals, many indexed in SCI/SCI‑E. He has 17 papers in national peer‑reviewed journals. He has given 5 presentations at international meetings.
His work centers on the cornea and anterior segment. Areas include keratoconus; DALK, PKP, and DSAEK; corneal biomechanics; and corneal cross‑linking. He also studies glaucoma surgery after keratoplasty, ocular surface disease and pseudoexfoliation, and neuro‑ophthalmology and retina. He contributed to 4 ophthalmology book translations. His studies compare DALK and PKP outcomes in keratoconus, analyze biomechanics after DALK, evaluate graft thickness after DSAEK, and compare trabeculectomy with the Ahmed valve in post‑PKP glaucoma.