Thessaloniki Vision Clinic is a specialized ophthalmology center in Thessaloniki, Greece. Its focus is corneal transplants, glaucoma surgery, and refractive vision correction. For layered corneal grafts, it reports a rejection rate of just 1%. Dr. Panagiotis Dervenis leads the clinic. He is a clinical researcher with over 25 publications in leading journals. These include Eye (Nature) and the British Medical Journal. He holds the FEBO diploma from the European Board of Ophthalmology.
Dr. Dervenis completed specialized training at Moorfields Eye Hospital in the United Kingdom. He has also practiced at King's College Hospital in London. Cataract surgery is a day procedure done with local anesthetic drops. This small-incision technique uses ultrasound energy and needs no stitches. For vision correction, advanced laser platforms support LASIK, PRK, and SMILE. The team uses femtosecond laser technology for maximum surgical accuracy.
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Dr. Dervenis completed specialized training at Moorfields Eye Hospital in the United Kingdom. He has also practiced at King's College Hospital in London. Cataract surgery is a day procedure done with local anesthetic drops. This small-incision technique uses ultrasound energy and needs no stitches. For vision correction, advanced laser platforms support LASIK, PRK, and SMILE. The team uses femtosecond laser technology for maximum surgical accuracy.
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Офтальмологиялық клиника Dr Nikolaos I Dervenis MD, MSc, PhD, FEBO — жеке тар ауқымды медициналық орталық Салоникиде, Греция. Орталықтың ұжымы офтальмологияға маманданған. Офтальмологиялық клиника ересектер мен балаларды қабылдайды. Жыл сайын 1 200 науқас медициналық көмек алу үшін осы клиниканы таңдайды. Көбінесе клиникаға Еуропа және Тәуелсіз Мемлекеттер Достастығы елдерінен, сондай-ақ Балқан елдерінен науқастар жүгінеді.
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Varies by technique and glaucoma type."},"contraindications":["Active eye infection or inflammation until controlled","Angle-closure glaucoma with extensive synechial closure (relative)","Neovascular glaucoma with active neovascularization (relative)","Unmanageable bleeding disorder or anticoagulation (relative)","Cannot lie still under local anesthesia (relative)"],"days_in_clinic":{"min":0,"max":0,"unit":"nights","qualifier":"Same-day discharge after uncomplicated adult surgery."},"diagnostic_duration_minutes":null,"diagnostic_preparation":null,"diagnostic_referral_needed":null,"diagnostic_result_time_hours":null,"exercise_resume_weeks":{"min":2,"max":4,"unit":"weeks","qualifier":"Strenuous exercise, heavy lifting and swimming after surgeon clearance; light walking is allowed from the first days."},"final_result_months":{"min":1,"max":3,"unit":"months","qualifier":"Pressure and vision stabilize; medications may be adjusted during this time."},"fly_home_after_days":{"min":7,"max":14,"unit":"days","qualifier":"After the day-1 and week-1 reviews show stable pressure and no significant hyphema; surgeon clearance required."},"follow_up_visits":[{"purpose":"wound_check","requirement":"routine","after":{"min":1,"max":2,"unit":"days","qualifier":"Day-1 check of pressure, hyphema and anterior chamber."}},{"purpose":"assessment","requirement":"routine","after":{"min":5,"max":7,"unit":"days","qualifier":"Week-1 check of pressure, healing and drop regimen."}},{"purpose":"result_review","requirement":"routine","after":{"min":28,"max":90,"unit":"days","qualifier":"Pressure control and medication adjustment."}}],"indications":["Adult open-angle glaucoma uncontrolled or progressing despite maximal medication","Adult open-angle glaucoma with intolerance to glaucoma eye drops"],"main_risks":["Hyphema, usually transient","Transient high or low intraocular pressure","Inflammation and blurred vision","Failure to reach target pressure, needing medication or further surgery","Cataract progression","Choroidal detachment or shallow chamber (uncommon)","Infection or endophthalmitis (rare)"],"pain":"Little pain during surgery; mild to moderate discomfort, foreign-body sensation and redness for a few days.","preparation":["Eye assessment: pressure, gonioscopy, optic nerve, visual fields","General health and medication review with the surgeon","Treatment of active eye infection or inflammation beforehand","Transport home and help after surgery","Facility fasting instructions"],"recovery_timeline":[{"phase":"Day 0-3","description":"Eye shielded; blurred vision, mild discomfort and redness; start prescribed drops. Light walking is allowed.","restrictions":["No rubbing or pressing the eye","Keep water and dirt away from the eye","No driving until vision cleared"]},{"phase":"Weeks 1-2","description":"Inflammation settles and vision improves; frequent drops continue.","restrictions":["Avoid heavy lifting and straining","Avoid dusty environments and eye makeup"]},{"phase":"Weeks 2-6","description":"Gradual return to normal activity; drops tapered and pressure monitored.","restrictions":["No swimming or contact sports until cleared"]}],"rehabilitation_days":{"min":7,"max":21,"unit":"days","qualifier":"Ordinary functional recovery of daily activities and vision after uncomplicated surgery."},"result_longevity":"Pressure control often lasts years but varies with glaucoma type, age and technique; lifelong monitoring is needed and later medications or surgery may be required.","revision_rate_pct":{"min":10,"max":30,"unit":"percent","qualifier":"Repeat glaucoma surgery within about 5 years in adults; higher in advanced disease or after prior failed surgery."},"scars":"No visible external scar; a small conjunctival and scleral incision is usually inconspicuous.","sessions_or_stages":{"sessions":{"min":1,"max":1,"unit":"visits","qualifier":"One operation per eye."},"stages":[{"code":"trabeculotomy","label":"Trabeculotomy in one eye","after":{"min":0,"max":0,"unit":"days","qualifier":"At the initial procedure."}}],"qualifier":"Single-stage per eye; follow-up visits are not treatment sessions."},"success":{"metric":"Intraocular pressure reduction of at least 20% or pressure within target, with or without medication","value":60,"unit":"percent of eyes","horizon":"1-2 years","population":"Adults with open-angle glaucoma after standalone ab externo trabeculotomy","evidence_status":"limited"},"techniques":[{"name":"Ab externo trabeculotomy (probe through Schlemm's canal via scleral flap) under local anesthesia","suits_whom":"Selected adults with open-angle glaucoma; not for children.","recovery":"Same-day discharge; recovery about 1-3 weeks."},{"name":"Ab interno trabeculotomy (gonioscopic or device-assisted, e.g., Trabectome, GATT, KDB)","suits_whom":"Mild to moderate open-angle glaucoma, often combined with cataract surgery.","recovery":"Often faster visual recovery; early hyphema common."}],"treatment_conditions":["day_case"],"treatment_duration_hours":{"min":0.5,"max":1.5,"unit":"hours","qualifier":"Operating time for standalone ab externo trabeculotomy in one eye."},"initial_assessment_documents":["Glaucoma diagnosis report with eye pressure history","Visual field test report","Optic nerve OCT scan","Gonioscopy report","Current glaucoma eye drops list","Previous eye surgery or laser reports (if available)"],"travel_trips":{"min":1,"max":1,"one_trip_possible":true,"qualifier":"Single-stage surgery per eye; stay about 7-14 days until day-1 and week-1 reviews clear flying. Later reviews possible at home."},"clinic_checks":{"status":"ok","items":[{"id":"C1","text":"Check the surgeon's experience and proficiency with the glaucoma procedure proposed, since selection should weigh it","scope":"treatment_type","source":{"url":"https://www.aao.org/education/clinical-statement/reporting-clinical-endpoints-in-studies-of-minimal","host":"aao.org","quote":"Selection of a glaucoma procedure must be tailored to the individual patient and should consider the surgeon’s experience and proficiency, the degree of IOP reduction needed based on severity and stability of disease, risk factors for complications, and the patient’s willingness to accept surgical risks and the potential need for additional surgery.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200}},{"id":"C2","text":"Ask how the proposed procedure fits the patient's disease severity and stability","scope":"treatment_type","source":{"url":"https://www.aao.org/education/clinical-statement/reporting-clinical-endpoints-in-studies-of-minimal","host":"aao.org","quote":"Selection of a glaucoma procedure must be tailored to the individual patient and should consider the surgeon’s experience and proficiency, the degree of IOP reduction needed based on severity and stability of disease, risk factors for complications, and the patient’s willingness to accept surgical risks and the potential need for additional surgery.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200}},{"id":"C3","text":"Ask about the risk of complications and the possibility of additional surgery","scope":"treatment_type","source":{"url":"https://www.aao.org/education/clinical-statement/reporting-clinical-endpoints-in-studies-of-minimal","host":"aao.org","quote":"Selection of a glaucoma procedure must be tailored to the individual patient and should consider the surgeon’s experience and proficiency, the degree of IOP reduction needed based on severity and stability of disease, risk factors for complications, and the patient’s willingness to accept surgical risks and the potential need for additional surgery.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200}},{"id":"C4","text":"Ask for certification information and the name of the body that certified the surgical setting","scope":"treatment_abroad","source":{"url":"https://www.isaps.org/discover/patients-home/considering-your-procedure-abroad/finding-a-surgeon-abroad/","host":"isaps.org","quote":"Ask for certification information and the name of the certifying body when assessing a surgical setting.","tier":"tier1_medical","fetched_at":"2026-11-11","http_status":200}},{"id":"C5","text":"Check that the surgeon who consults with you is the same person who will carry out the procedure","scope":"treatment_abroad","source":{"url":"https://travelaware.campaign.gov.uk/surgery-abroad-cut-out-the-risk/","host":"travelaware.campaign.gov.uk","quote":"Check that the surgeon you consult with, will be the same person carrying out the procedure.","tier":"tier1_medical","fetched_at":"2026-11-11","http_status":200}}],"checked_at":"2026-11-14","next_check_at":"2027-11-14","version":1},"red_flags":{"status":"ok","items":[{"id":"F1","text":"The offer does not name the surgeon's experience with the glaucoma procedure proposed","scope":"treatment_type","source":{"url":"https://www.aao.org/education/clinical-statement/reporting-clinical-endpoints-in-studies-of-minimal","host":"aao.org","quote":"Selection of a glaucoma procedure must be tailored to the individual patient and should consider the surgeon’s experience and proficiency, the degree of IOP reduction needed based on severity and stability of disease, risk factors for complications, and the patient’s willingness to accept surgical risks and the potential need for additional surgery.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200}},{"id":"F2","text":"The offer recommends one procedure without an individual assessment of the patient","scope":"treatment_type","source":{"url":"https://www.aao.org/education/clinical-statement/reporting-clinical-endpoints-in-studies-of-minimal","host":"aao.org","quote":"Selection of a glaucoma procedure must be tailored to the individual patient and should consider the surgeon’s experience and proficiency, the degree of IOP reduction needed based on severity and stability of disease, risk factors for complications, and the patient’s willingness to accept surgical risks and the potential need for additional surgery.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200}},{"id":"F3","text":"The surgeon cannot explain how the proposed procedure fits the patient's disease severity and stability","scope":"treatment_type","source":{"url":"https://www.aao.org/education/clinical-statement/reporting-clinical-endpoints-in-studies-of-minimal","host":"aao.org","quote":"Selection of a glaucoma procedure must be tailored to the individual patient and should consider the surgeon’s experience and proficiency, the degree of IOP reduction needed based on severity and stability of disease, risk factors for complications, and the patient’s willingness to accept surgical risks and the potential need for additional surgery.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200}},{"id":"F4","text":"The diagnosis rests only on an eye-pressure check, with no complete eye exam","scope":"treatment_type","source":{"url":"https://www.aao.org/eye-health/diseases/what-is-glaucoma","host":"aao.org","quote":"A glaucoma screening that only checks eye pressure is not enough to find glaucoma.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200}}],"checked_at":"2026-11-14","next_check_at":"2027-11-14","version":1},"warning_signs":{"status":"ok","items":[{"id":"W1","text":"Worsening eye drainage","urgency":"contact_clinic","general":false,"source":{"url":"https://www.chp.edu/our-services/ophthalmology/ophthalmology-patient-procedures/trabeculotomy","host":"chp.edu","quote":"Signs of infection, such as eye drainage that has gotten worse or has changed to green or yellow","tier":"tier1_medical","fetched_at":"2026-11-12","http_status":200}},{"id":"W2","text":"Worsening eye pain","urgency":"contact_clinic","general":false,"source":{"url":"https://www.chp.edu/our-services/ophthalmology/ophthalmology-patient-procedures/trabeculotomy","host":"chp.edu","quote":"Pain that has gotten worse","tier":"tier1_medical","fetched_at":"2026-11-12","http_status":200}},{"id":"W3","text":"Persistent nausea and vomiting","urgency":"contact_clinic","general":true,"source":{"url":"https://www.chp.edu/our-services/ophthalmology/ophthalmology-patient-procedures/trabeculotomy","host":"chp.edu","quote":"Nausea and vomiting that won’t go away","tier":"tier1_medical","fetched_at":"2026-11-12","http_status":200}}],"checked_at":"2026-11-12","next_check_at":"2027-11-12","version":1},"take_home":{"status":"ok","items":[{"id":"T1","text":"Ask for written details of the procedure before you leave the hospital","document":"written procedure details","source":{"url":"https://rcseng.ac.uk/patient-care/cosmetic-surgery/after-surgery/","host":"rcseng.ac.uk","quote":"After your surgery, before you leave the hospital, ask for written information about the procedure you've had.","tier":"tier1_medical","fetched_at":"2026-11-11","http_status":200}},{"id":"T2","text":"Home doctor needs the clinic's follow-up recommendations in a written discharge summary","document":"discharge summary","source":{"url":"https://sbuhb.nhs.wales/about-us/individual-patient-commissioning/ipc-folder/advice-on-accessing-treatment-abroad","host":"sbuhb.nhs.wales","quote":"When you have treatment abroad, you must ask the treatment provider for their follow-up recommendations documented within a written discharge summary in English.","tier":"tier1_medical","fetched_at":"2026-11-11","http_status":200}},{"id":"T3","text":"Ask for copies of all prescriptions before you leave","document":"prescription copies","source":{"url":"https://travelhealthpro.org.uk/news/699/travelling-abroad-for-treatment","host":"travelhealthpro.org.uk","quote":"Remember to ask for copies of all your treatment records, including prescriptions, scans and x-rays before you leave.","tier":"tier1_medical","fetched_at":"2026-11-11","http_status":200}},{"id":"T4","text":"Home doctor needs the dates for required blood tests and follow-up appointments","document":"written aftercare plan","source":{"url":"https://sbuhb.nhs.wales/about-us/individual-patient-commissioning/ipc-folder/advice-on-accessing-treatment-abroad","host":"sbuhb.nhs.wales","quote":"This should include any medication and doses, as well as any dates that blood tests and follow-up appointments must be carried out.","tier":"tier1_medical","fetched_at":"2026-11-11","http_status":200}}],"checked_at":"2026-11-14","next_check_at":"2027-11-14","version":1},"alternatives":{"status":"ok","items":[{"id":"A1","text":"Your open-angle glaucoma can be managed with a daily medicine","name":"Glaucoma eye drops","source":{"url":"https://www.aao.org/eye-health/diseases/what-is-glaucoma","host":"aao.org","quote":"Used every day, these eye drops lower eye pressure.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200},"operation_id":null},{"id":"A2","text":"Your open-angle glaucoma could be treated instead of or alongside medicines","name":"Laser trabeculoplasty","source":{"url":"https://www.aao.org/eye-health/diseases/what-is-glaucoma","host":"aao.org","quote":"This surgery is for people who have open-angle glaucoma and can be used instead of or in addition to medications.","tier":"tier1_medical","fetched_at":"2026-11-14","http_status":200},"operation_id":621}],"checked_at":"2026-11-14","next_check_at":"2027-11-14","version":1},"technique_details":{"status":"ok","items":[{"id":"ab-externo-trabeculotomy","name":"Ab externo trabeculotomy (probe through Schlemm's canal via scleral flap) under local anesthesia","how_it_works":{"status":"missing","reason":"no_official_source"},"recovery_daily":{"status":"missing","reason":"no_official_source"}},{"id":"ab-interno-trabeculotomy","name":"Ab interno trabeculotomy (gonioscopic or device-assisted, e.g., Trabectome, GATT, 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