Басты бетке

13 бет - Ең жақсы офтальмологияның офтальмологтар - ЖОҒ-326 дәрігерлер

Контент Bookimed редакциялық саясатына сәйкес келеді және оның сапасын тексерген

Фахад Мавлюд

Erkan Unsal

  • 5 Керемет 1 пікірлер
  • 28 жылдар тәжірибе
  • Түркия, Ізмір, Dunyagoz Eye Hospital Izmır
  • Place and Date of Birth

    • Nevşehir, 1974

    Language Skills

    • English

    Education and Experience

    • 1997 Cerrahpaşa Faculty of Medicine
    • 2003 Ege University Faculty of Medicine Eye Diseases
    • 2005 GATA Ankara (Military Service)
    • 2018 İstanbul Training and Research Hospital (Assoc.)

    National and International Publication number

    • Over 50

    Case Experience

    • More than 20,000 surgical cases experience, 20 years of active service as an ophthalmologist

    Associations

    • TOD (Turkish Society of Ophthalmology)
    • AAO (American Academy of Ophthalmology)
  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Merih Oray

  • 4.7 Керемет 43 пікірлер
  • 20 жылдар тәжірибе
  • Түркия, Істанбұл, Dunyagoz Eye Hospital Istanbul Etiler
  • CURRICULUM VITAE

    Place and Date of Birth

    • Adana, 1981

    Language Skills

    • English

    Education and Experience

    • • 1999-2005 Istanbul University, Istanbul Faculty of Medicine, Istanbul
    • • 2005-2010 Marmara University, Faculty of Medicine, Ophthalmology, Istanbul (Specialization)
    • • 2010-2012 Muş State Hospital (Compulsory Service)
    • • 2011 Yale University New Haven Hospital, Ophthalmology, Connecticut / USA
    • • 2012-2017 Istanbul University, Istanbul Faculty of Medicine, Ophthalmology, Istanbul (Specialist Dr.)
    • • 2015 Massachusetts Eye Research and Surgery Institution, United States (Fellow / Research assistant)
    • • 2017 Istanbul University, Istanbul Faculty of Medicine, Ophthalmology, Istanbul (Associate Professor Dr.)

    Number of Scientific Publications

    • Over 150 scientific presentations, publications and articles

    Case Experience

    • Experience of over 15.000 surgery cases in 16 years

    Membership

    • • Turkish Ophthalmology Association (TOD)
    • • Turkish Ophthalmology Association Uvea-Behçet Unit
    • • American Academy of Ophthalmology (AAO)
    • • American Uveitis Society (AUS)
    • • International Ocular Inflammation Society (IOIS)
    • • International Society for Behçet's Disease (ISBD)
    • • The Foster Ocular Immunology Society (FOIS)
    • • Tarsus American College Alumni Association
  • Толығырақ оқу
IntraLase әдісімен лазерлік көруді түзету
$750 - $950
Хрусталикті мультифокальды линзамен алмастыру
$6,290 - $6,290
Фоторефракциялық кератэктомия
$656 - $875
Ақпарат

Cuneyt Karaarslan

  • Жаңа
  • 22 жылдар тәжірибе
  • Түркия, Адана, Dunyagoz Eye Hospital Adana
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Bayram Gulpamuk

  • Жаңа
  • 13 жылдар тәжірибе
  • Түркия, Қонья, Dunyagoz Eye Hospital Konya
  • Curriculum Vitae

    Place and Date of Birth

    • Izmir, 1988

    Language Skills

    • English

    Education and Experience

    • 2013-2017 SBU Ulucanlar Eye Education and Research Hospital
    • 2016 Moorfields Eye Hospital (London-Observer)
    • 2017-2020
    • Konya Beyhekim Education and Research Hospital 2020-Present Dunyagoz Hospital Konya

    Memberships

    • Turkish Ophthalmology Association (TOD)
    • Ankara Medical Chamber
    • Konya Medical Chamber

      National and International Publications

    Scientific Studies Presented at International and National Meetings

    1. Optical Coherence Tomography Findings in Retinitis Pigmentosa Cases . Bayram GÜLPAMUK , Mehmet ÇITIRIK. TOD 51st National Ophthalmology Congress. (Oral Presentation)

    2. Investigation of Factors Affecting Resolution in Accommodative Esotropia. Meltem Özgül Yılmazoğlu, Sibel Polat, Çiğdem Can, Mustafa Alpaslan Anayol, Selda Çelik, Bayram Gülpamuk , Pelin Yılmazbaş. (Oral Presentation)

    3. Characteristics and Clinical Course of Multiple Sclerosis/Demyelinating Disease Associated Uveitis Cases Presenting with Ocular Findings First. Merve İnanç, Müge Pınar Çakar Özdal, Bayram Gülpamuk , Selim Selçuk Çomoğlu, Hayat Güven (Oral Presentation)

    4. Evaluation of Lens Densitometry Measurements After Intravitreal Slow-Release Dexamethasone Implant Injection with Scheimpflug Imaging Method. Mehmet Ali Şekeroğlu, Mustafa Alpaslan Anayol, Bayram Gülpamuk , Pelin Yılmazbaş. 49th TOD National Ophthalmology Congress, SS-TR-40. (Oral Presentation)

    5. Altıntaş AGK, Gulpamuk B , Cıtırık M. Isolated ectopic fovea 16 th Euretina Congress 8-11 September 2016 Copenhagen pp 109

    6. Altıntaş AGK , Gulpamuk B. Comparison of phaco parameters in diabetic eyes and normal cataract eyes. XXXIV Congress of ESCRS 10-14 September 2016 Copenhagen pp 107

    7. Altıntaş AGK, Gulpamuk B. Evaluation of correlation between axial length and phacoparameters XXXIV Congress of ESCRS 10-14 September 2016 Copenhagen pp 107

    8. Bayram Gulpamuk, Pinar Cakar Özdal. Clinical course of Vogt-Koyanagi Harada disease in Turkey.9th International Symposium on Uveitis August 2016, P11.

    9. M.Teke, B.Gulpamuk. Three congenital retinal macrovessels and one of which co-exists with a cilioretinal artery. 16th Euretina Congress 8-11 September 2016 Copenhagen pp 109.

    10. Pınar Ç.Özdal, K.tekin, B.Gülpamuk , MYTeke. Intravitreal aflibercept fort he treatment of chronic central serous chorioretinopathy. EURETINA 17.

    11. Bayram Gulpamuk. Thiol/Disuphide homeostasis in patients with keratoconus by a novel assay. 10th International Conference on Clinical & Experimental Ophthalmology November 21-23, 2016 Dubai, UAE.

    12. Bayram Gülpamuk , Ufuk Elgin, Emine Şen. Glaucoma profile and clinical features in patients with diabetes mellitus.TOD 50th National Ophthalmology Congress, PS-0021.

    13. Bayram Gülpamuk , Mehmet Ali Şekeroğlu, Mustafa Alpaslan Anayol, Pelin Yılmazbaş. An important parasitic infestation in the differential diagnosis of blepharitis: Pityriasis Palpebrarum.TOD 49th National Ophthalmology Congress, PS-0385.

    14. Ayse Gül Koçak Altıntaş, Bayram Gülpamuk , Mehmet Çıtırık, Veysel Cankurtaran. Correlation of Central Macular Thickness and HemoglobinA1c Values in Nonproliferative Diabetic Retinopathy Cases, PS-0880.

    15. Comparison of Phacoemulsification Parameters in Cases with Different Axial Lengths. Ayşe Gül Koçak Altıntaş, Bayram Gülpamuk , Veysel Cankurtaran. TOD 49th National Ophthalmology Congress, SS-KRC-03. (Oral Presentation)

  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Ali Tarik Sakoglu

  • Жаңа
  • 23 жылдар тәжірибе
  • Түркия, Самсун, Dunyagoz Eye Hospital Samsun
  • CURRICULUM VITAE

     

    Place and Date of Birth

    • Kavak, 1959

    Language Skills

    • English

    Education and Experience

    • 1986 Ankara School of Medicine
    • 1995, Ankara Hospital (specialization)

     

    Case Experience

    • Experience with more than 15,000 surgical cases during 19 years of active service as an ophthalmologist.

     

    Memberships

    • TOD (Turkish Society of Ophthalmology)
  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Duruye Ilbaga

  • Жаңа
  • 32 жылдар тәжірибе
  • Түркия, Самсун, Dunyagoz Eye Hospital Samsun
  • CURRICULUM VITAE

    Place and Date of Birth

    • 1958, Ankara

    Language Skills

    • English

    Education and Experience

    • Cumhuriyet University School of Medicine
    • Cumhuriyet University School of Medicine (Specialization)

    Memberships

    • TOD (Turkish Society of Ophthalmology)

    Case Experience

    • Experience with more than 10,000 surgical cases during 30 years of active service as an ophthalmologist.
  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Sezer Ozkan

  • Жаңа
  • 10 жылдар тәжірибе
  • Түркия, Самсун, Dunyagoz Eye Hospital Samsun
  • CURRICULUM VITAE

    Place and Date of Birth

    • İskenderun, 1979

    Language Skills

    • English

    Education and Experience

    • 2008 Okmeydanı Training and Research Hospital (Specialization)
    • 2002 Istanbul University School of Medicine

    Case Experience

    • Experience with more than 10,000 cases over 6 years of active service as an ophthalmologist.

    Memberships

    • TOD (Turkish Society of Ophthalmology)
  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Levent Ersan

  • 4.7 Керемет 43 пікірлер
  • 39 жылдар тәжірибе
  • Түркия, Істанбұл, Dunyagoz Eye Hospital Istanbul Etiler
  • CURRICULUM VITAE

    Place and Date of Birth

    • Samsun, 1959

    Language Skills

    • English

    Education and Experience

    • Hacettepe University, Faculty of Medicine
    • Istanbul Haydarpasa Numune Hospital (Specialization)

    Case Experience

    • Experience of over 20.000 surgery cases

    Memberships

    • Turkish Ophthalmology Association
    • Turkish Medical Association
    • ESCRS (European Society of Cataract and Refractive Surgeon)
    • ASCRS (American Society of Cataract and Refractive Surgery)
    • AAO (American Academy of Opthalmology)

    Seminars

    • -I introduced this subject for the first time in Turkey with the seminars I gave on Eye and Complementary Medicine (Iridology) on the Natural Body, Mind and Mental Health Festival, Military Museum Harbiye Cultural Site.

    Awards

    • TÜBİTAK Turkey First Place in Biology with my scientific research on the eye in my second year of high school.

    Scientific Studies

    • Creating visual awareness with sound waves (Echolocation) in blind people

    National Publications

    • The importance of retinal nerve fiber photography in the diagnosis of glaucoma
  • Толығырақ оқу
IntraLase әдісімен лазерлік көруді түзету
$750 - $950
Хрусталикті мультифокальды линзамен алмастыру
$6,290 - $6,290
Фоторефракциялық кератэктомия
$656 - $875
Ақпарат

Ali Ahmetoglu

  • 4.6 Керемет 4 пікірлер
  • 23 жылдар тәжірибе
  • Түркия, Істанбұл, Dunyagoz Eye Hospital Istanbul Atakoy
  • CURRICULUM VITAE

    Place and Date of Birth

    • Azerbaycan, 1972

    Language Skills

    • English, Russian

    Education and Experience

    • Istanbul University, Cerrahpaşa Medical Faculty (1991-1996)
    • Istanbul Çapa Medical Faculty (1996 – 2000)

    Number of Scientific Publications

    • 60

    Case Experience

    • Experience of over 34.000 surgery cases

    Memberships

    • TOD (Turkish Ophthalmology Association)

    Certificates

    • ICO The Visual Sciences in Ophthalmology
  • Толығырақ оқу
Көз протезі
$2,430 - $2,710
Хрусталикті мультифокальды линзамен алмастыру
$6,020 - $6,020
Ақпарат

Melike Gedar

  • 4.6 Керемет 4 пікірлер
  • 26 жылдар тәжірибе
  • Түркия, Істанбұл, Dunyagoz Eye Hospital Istanbul Atakoy
  • Place and Date of Birth

    • 1972

    Language Skills

    • English

    Education and Experience

    • Hacettepe University, School of Medicine (Undergraduate Education)
    • Bahçeşehir University, School of Medicine (Education Commission Membership)

    Memberships

    • TOD (Turkish Society of Ophthalmology)

      International Articles

    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.


     

     

  • Толығырақ оқу
Көз протезі
$2,430 - $2,710
Хрусталикті мультифокальды линзамен алмастыру
$6,020 - $6,020
Ақпарат

Gokcen Gokce

  • 5 Керемет 1 пікірлер
  • 22 жылдар тәжірибе
  • Түркия, Ізмір, Dunyagoz Eye Hospital Izmır
  • Curriculum Vitae

    Place and Date of Birth

    • Hendek , 1980

    Language Skills

    • English

    Education and Experience

    • 1998-2004 Gülhane Military Medical Academy (Medical Training)
    • 2007-2011 Gülhane Military Medical Academy (Specialization)
    • 2016 Gülhane Military Medical Academy (Associate Professorship)

    Case Experience

    Over 10.000 surgical cases.

    Certificates

    • Cornea and Refractive Surgery (Excimer Laser) Course
    • SMILE Laser Surgery Courses
    • Interlase Femto-LASIK (i-LASIK) Training Certificate
    • IFS Femtolaser Cataract Suit Training Certificate
    • Keratoplasty (Corneal Transplantation) Course
    • Nidek Quest Excimer Laser Certificate
    • Cornea Bank Medical Directorship Certificate
    • Certificate for the Treatment of High Astigmatism with Femtolaser
    • Certificate for Keratoconus Corneal Ring with Femtolaser
    • Certificate for Keratoplasty/Corneal Tunnel with Femtolaser
    • International Strabismological Association Course for the Treatment of Strabimus
    • Applied Strabismological Surgery Course
    • Periorbital Plastic Surgery, Botox and Fillers Course
    • Oculoplasty Course
    • Applied Glocoma Surgery Course
  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Ahmet Karacor

  • 4.9 Керемет 9 пікірлер
  • 45 жылдар тәжірибе
  • Түркия, Анталия, Dunyagoz Eye Hospital Antalya
  • Place and Date of Birth

     

    • Antalya , 1954

    Language Skills

     

    • English

    Education and Experience

     

    • Istanbul University, Çapa Faculty of Medicine, 1977
    •  
    • Akdeniz University Faculty
    •  
    • Mardin University Faculty
    •  
    • Antalya Education and Research Hospital
    •  

    Case Experience

     

    • Experience of more than 10,000 surgical cases.
  • Толығырақ оқу
Хрусталикті мультифокальды линзамен алмастыру
$4,923 - $4,923
ReLEx SMILE әдісімен көргенді лазерлік түзеу
$2,177 - $2,177
Катаракта операциясы және ИОЛ имплантациясы
$1,860 - $2,407
Ақпарат

Ayhan Dursun

  • 5 Керемет 1 пікірлер
  • 21 жылдар тәжірибе
  • Түркия, Сивас, Medicana Sivas Hospital
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Emel Basar

  • Жаңа
  • 50 жылдар тәжірибе
  • Түркия, Істанбұл, Biruni University Hospital
  • Education

    • Uludag Faculty of Medicine, Ophthalmology Residency, 1980, Bursa/Turkey
    • Cerrahpaşa Medical Faculty, Ophthalmology Residency, 1978, Istanbul/Turkey
    • Istanbul University Faculty of Medicine, Doctor of Medicine Education, 1974, Istanbul/Turkey
    •  

    Experience

    • Cerrahpasa Faculty of Medicine, 1990-2019, Istanbul/Turkey
    • Koç Foundation American Hospital, 2002-2006, Istanbul/Turkey
    • Pittsburgh Children Hospital Ophtalmology Department, 1997, United States of America
    • New York Eye and Ear Hospital, 1995, United States of America
    • King Abdulaziz University, Jeddah, 1984-1990, Saudi Arabia
    • Glasgow Tennent Eye Institute, 1983, United Kingdom
    • Uludağ University, 1978-1984, Bursa/Turkey
    • Cerrahpaşa Faculty of Medicine, 1976-1978, Istanbul/Turkey

     

    Medical Intrests

    • Seventh Nerve Palsy (Lagophthalmos) Treatment, Gold Plate and Hyaluronic Acid Injection Applications
    • Double Vision (Diplopia) Treatment
    • Botox Applications Around the Eyes (Botulinum Toxin)
    • Eyelid Plastic, Aesthetic Surgeries
    • Treatment of Tear Duct Blockages in Children
    • Eyelid drooping - Ptosis (in children and adults)
    • Treatment of lazy eye (amblyopia)
    • Botox (Botulinum Toxin) Treatment in Nystagmus
    • Nystagmus Treatment
    • Botox (Botulinum Toxin Application) for Eye Movement Paralysis in Diabetic Patients
    • Botox (Botulinum Toxin) Treatment in Strabismus (Children and Adults)
    • Transposition Surgery in Strabismus (Children and Adults)
    • Strabismus Surgery - Strabismus in Vertical Plane (Children and Adults)
    • Strabismus Surgery - Horizontal Strabismus (Children and Adults)
    • Strabismus

     

  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Giray Ersoz

  • Жаңа
  • 17 жылдар тәжірибе
  • Түркия, Істанбұл, Biruni University Hospital
  • Medical Intrests

    • Medical retina
    • Cataract surgery
    • Smart lens surgeries
    • Yellow spot disease
    • Retinal disorders due to diabetes
    • Retinal vascular occlusions
    • Intraocular needle treatments
    • Hereditary retinal diseases
    • Chicken black
    • PRP treatment
    • Retinal laser treatments
    • Retinal tear
    • Retinal detachment
    • Epiretinal membrane
    • Macular hole
    • Retinopathy of prematurity
    • Glaucoma (medical treatment)
    •  

    Education

    Istanbul Retina Institute
    Retinal Diseases and Vitreoretinal Surgery Training
    2016, Istanbul / Turkey

    Health Sciences University Izmir Tepecik Training and Research Hospital
    Ophthalmology Residency
    2014, Izmir / Turkey

    Ankara University Faculty of Medicine
    Doctor of Medicine Education
    2009, Ankara / Turkey

    Experience

    Koç University Hospital
    2020-2021, Istanbul / Turkey

    Istanbul Retina Institute
    2016-2020, Istanbul / Turkey

    Mardin Kızıltepe State Hospital
    2015-2016, Mardin / Turkey

    Izmir Tepecik Training and Research Hospital
    2010-2015, Izmir / Turkey

    Awards

    2010 April Medical Specialty Examination (TUS) Turkey ranked first.
    In July 2016, he was selected for the "Retina - Macula - Vitreous Diseases & Surgery Clinical Researcher" program of Istanbul Retina Institute.
    He has conducted more than 50 scientific studies on retinal diseases, most of which were published in international top class journals.
    With his scientific studies on retinal diseases, he was entitled to become an active member of the Medical Retina Unit and Vitreoretinal Surgery Unit of the Turkish Ophthalmology Association (TOD).
    TOD National Congress, 2016 Best Surgical Video Second Prize.
    TOD Retina Research Awards, 2019 Third Prize.
    2019 In 2020, he passed the European Board of Ophthalmology (EBO) exam and became a FEBO (Fellow of European Board of Ophthalmology).
    2020 He was entitled to receive the title of Associate Professor in the same year and received the Second Prize in the Best Article Awards of the Turkish Journal of Ophthalmology.
    His instagram account @retina.review, which he established to share information with ophthalmologists about retinal diseases, is followed by over 57 thousand ophthalmologists, mostly from the United States. In addition, this account has been recognized as one of the best accounts sharing information about ophthalmology education by Eyenews.uk.com, a website that publishes on ophthalmology in the UK.

     

     

  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Mehmet Murat Oncel

  • Жаңа
  • 39 жылдар тәжірибе
  • Түркия, Істанбұл, Risus Clinic Istanbul
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Jaime Luis Almendral Gomez

  • Жаңа
  • 11 жылдар тәжірибе
  • Испания, Мадрид, Hospital Universitario HM Puerta Del Sur
    • Ophthalmologist at Aranaz Salud, Arturo Soria, Madrid (2021 - present).
    • Glaucoma Section at the University Hospital of Fuenlabrada, Madrid (2019-present).
    • Ophthalmology Service at Hospital HM Puerta del Sur, Madrid (2020 - present).
    • MIR of Ophthalmology at the San Carlos Clinical Hospital, Madrid (2015-2019).
  • Толығырақ оқу
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Anna Mec-slomska

  • 4.2 Жақсы 73 пікірлер
  • 14 жылдар тәжірибе
  • Польша, Еленя-Ґура, KCM Clinic
Катарактаға операция (екі көз)
$1,730 - $1,730
Сетчатканың ажырауы кезінде операция
$2,188 - $2,735
Катаракта операциясы және ИОЛ имплантациясы
$987.99 - $2,963.96
Ақпарат

Stephany Ramirez

  • Жаңа
  • 7 жылдар тәжірибе
  • Доминикан Республикасы, Санто-Домінго, Dystec Dental Clinic
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат

Filiz Imadoglu

  • Жаңа
  • 26 жылдар тәжірибе
  • Түркия, Істанбұл, Uniqacare Clinic
Дәрігерге бару
Бағасы сұрау бойынша
Ақпарат