Eyyüp Karahan

ORCID: 0000-0003-2099-1991
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About
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Research Areas
  • Glaucoma and retinal disorders
  • Retinal Diseases and Treatments
  • Retinal Imaging and Analysis
  • Intraocular Surgery and Lenses
  • Retinal and Macular Surgery
  • Corneal surgery and disorders
  • Retinal and Optic Conditions
  • Ocular Diseases and Behçet’s Syndrome
  • Ophthalmology and Visual Impairment Studies
  • Ophthalmology and Eye Disorders
  • Corneal Surgery and Treatments
  • Retinopathy of Prematurity Studies
  • Ocular Infections and Treatments
  • Vascular Malformations Diagnosis and Treatment
  • Ocular and Laser Science Research
  • Ocular Surface and Contact Lens
  • Cerebral Venous Sinus Thrombosis
  • Ocular Disorders and Treatments
  • Intracerebral and Subarachnoid Hemorrhage Research
  • Urologic and reproductive health conditions
  • Obstructive Sleep Apnea Research
  • Neurosurgical Procedures and Complications
  • Intraoperative Neuromonitoring and Anesthetic Effects
  • Traumatic Ocular and Foreign Body Injuries
  • Chemokine receptors and signaling

Balıkesir University
2020-2025

Çevre ve Şehircilik Bakanlığı
2023

Columbia University
2020

Dünyagöz Hospital
2017-2018

Ministry of Health
2017-2018

Sağlık Bilimleri Üniversitesi
2018

Izmir Tepecik Eğitim ve Araştırma Hastanesi
2017

Istanbul Eye Hospital
2016-2017

Şifa University
2015-2016

Education Training And Research
2016

Purpose. The aim of this study is to examine the influence capsulotomy size on, spherical equivalent (SE), intraocular pressure (IOP), and macular thickness. Materials Methods. Sixty-eight patients were examined preoperatively 1, 4, 12 weeks after Nd:YAG capsulotomy. Patients divided into two groups based on postoperative size. Changes in SE, IOP, thickness compared between groups. Results. We found a higher hyperopic shift large group. In both 1 2, IOP increased week postoperatively....

10.1155/2014/846385 article EN cc-by Journal of Ophthalmology 2014-01-01

Multiple myeloma is primarily diagnosed through extraocular findings; however, in patients who have not yet received a diagnosis, hyperviscosity retinopathy and/or paraproteinemic maculopathy may present as initial symptoms. In diabetic patients, the clinical diagnosis can become even more complicated due to ocular findings. Two presented with retinal hemorrhages and macular edema that did respond intravitreal anti-vascular endothelial growth factors. The “silent macula”...

10.20944/preprints202501.0492.v1 preprint EN 2025-01-07

Objective: The aim of the study is to evaluate autonomic nervous system (ANS) activity by assessing static and dynamic pupillary light responses in central serous chorioretinopathy (CSCR). Materials Methods: A case-control study. Thirty eyes 30 patients with CSCR who were previously diagnosed our clinic included group, 31 right healthy participants control group. All underwent a complete ophthalmologic examination. Static pupillometry values measured Scheimpflug/Placido photo-based...

10.53424/balikesirsbd.1613770 article EN Balıkesır Health Sciences Journal 2025-03-28

To investigate the effect of oral caffeine intake on choroidal thickness using optical coherence tomography (OCT).Eighteen otherwise healthy users and 18 controls were enrolled. All participants underwent OCT scanning with high-speed resolution spectral-domain device (3D 2000, Topcon, Japan) at baseline, 1 3 h following 200-mg in study after placebo control group. The measurements taken morning (10-12 am) to avoid diurnal fluctuation.The median fovea prior was 337.00 (IQR 83.75) μm, which...

10.3109/15569527.2014.912659 article EN Cutaneous and Ocular Toxicology 2014-05-27

To investigate the retinal nerve fiber layer (RNFL) thickness changes in patients with obstructive sleep apnea syndrome (OSAS) for one year follow-up. discuss possibility of detecting tendency glaucoma this population by using spectral domain optical coherence tomography (3D-OCT-2000 Spectral domain).After polysomnographic study, all subjects (64 OSAS and 40 controls) underwent detailed ophthalmological examination. After these examinations, who had and/or systemic disease were excluded from...

10.3980/j.issn.2222-3959.2014.04.22 article EN DOAJ (DOAJ: Directory of Open Access Journals) 2014-01-01

Intravitreal application of Ozurdex ® (Allergan, Inc., Irvine, CA, USA) which is a biodegradable, sustained-release dexamethasone implant has been reported to be effective in the treatment macular edema. Migration such into anterior chamber recently described cases without perfect zonular or posterior capsular integrity. Herein, we report first case with migration that mislocated just behind intraocular lens (IOL) an intact bag. It thought migrated anteriorly towards through weak zonules as...

10.4103/0301-4738.146763 article EN cc-by-nc-sa Indian Journal of Ophthalmology 2014-01-01

To evaluate the effectiveness of intravitreal injection ranibizumab (IVR) in treating diabetic macular edema (DME) with serous retinal detachment (SRD) based on spectral domain optical coherence tomography (SD-OCT) patterns.One hundred thirty-four eyes 134 patients DME who underwent SD-OCT evaluation were included this study. We retrospectively analyzed medical records received IVR for treatment DME. Their classified into three groups according to following features: SRD, diffuse thickness...

10.3341/kjo.2017.0117 article EN cc-by-nc Korean Journal of Ophthalmology 2018-01-01

To compare noncycloplegic and cycloplegic results of Retinomax measurements with findings achieved after cycloplegia using table-top autorefractor retinoscopy.The study included 127 patients (mean age 96.7mo, range 21 to 221). (Rmax) (Nikon Inc., Japan) was used obtain refraction. Under cycloplegia, refraction measured Rmax, (TTR) NRK 8000, retinoscopy. The values sphere, spherical equivalent, cylinder axis were recorded for TTR retinoscopy in each eye. All analyzed statistically.THE MEAN...

10.3980/j.issn.2222-3959.2014.03.19 article EN DOAJ (DOAJ: Directory of Open Access Journals) 2014-01-01

To elucidate the relationship between systemic risk factors and different patterns of diabetic macular edema (DME) determined with optical coherence tomography (OCT).In this cross-sectional study, DME was classified by OCT as diffuse retinal thickness (DRT), cystoid (CME) serous detachment (SRD) evaluated.Of 57 patients DME, 21 (36.8%) had DRT, 24 (42.1%) CME 12 (21.0%) SRD. Micro- or macro-albuminuria significantly higher in DRT pattern (61.9%) compared SRD (50.0%) (25.0%; P=0.040)....

10.18240/ijo.2018.07.21 article EN cc-by-nc-nd International Journal of Ophthalmology 2018-07-10

To evaluate the normal distribution of exophthalmometric values in Turkish adult population and effect age, gender, refractive status axial length on globe position.One hundred twenty-two males 114 healthy females with age ranging from 18 to 87 years were included study. The study was recruited patients presenting our institution for routine examination. Hertel exophthalmometer used measure degree ocular protrusion. Effect error, interpupillary distance, position detected linear regression...

10.2174/1874364101509010113 article EN The Open Ophthalmology Journal 2015-06-08

The purpose of this study was to compare the short-term changes in retina and choroidal tissue after femtosecond laser-assisted cataract surgery (FLACS) standard phacoemulsification (PE) surgery.In all, 25 eyes undergoing FLACS 27 PE were included nonrandomized, retrospective, cross-sectional study. Central retinal thickness (CRT) (CT) measured pre- postoperatively (at day 1, 1 week later, month) with spectral domain optical coherence tomography (OCT) all patients compared. For group...

10.2147/opth.s127792 article EN cc-by-nc Clinical ophthalmology 2017-08-01

To evaluate the relation of central corneal thickness (CCT) and intraocular pressure (IOP) in preterm full-term newborns.The study included infants who were admitted to neonatal intensive care unit. A group consecutive newborns served as control group. Linear multiple regression analysis carried out assess association IOP with sex, gestational/postconceptional age, birthweight, mean oxygenation time, stages retinopathy prematurity (ROP), CCT. also CCT ROP.Mean was 17.5 ± 2.1 mm Hg premature...

10.5301/ejo.5000494 article EN European Journal of Ophthalmology 2014-01-06

To investigate the macular changes in eyes filled with silicone oil (SO) and course of these after SO removal.A retrospective optical coherence tomography scan review was conducted for twenty-four patients who underwent uncomplicated pars plana vitrectomy tamponade complex retinal detachments were detected before, one week, month three months removal.Mean duration 3.6±1.0mo (range: 3-7mo). Cystoid edema (CME) 3 before removal. Submacular fluid represented 1 eye Resolution CME submacular...

10.3980/j.issn.2222-3959.2014.06.17 article EN DOAJ (DOAJ: Directory of Open Access Journals) 2014-01-01

To evaluate the retinal and choroidal vascular structures in patients with anxiety disorders.

10.1177/11206721241228620 article EN European Journal of Ophthalmology 2024-01-30

The aim was to investigate the correlation of serum cortisol level with choroidal thickness.Sixty-six healthy volunteers had no visual complaints or history ocular disease. Subfoveal thickness at foveal centre measured spectral domain optical coherence tomography (SD-OCT). Morning levels were obtained 8:00 am immediately following SD-OCT measurement. Measurements only right eyes included in study. Age, gender, axial length and spherical equivalent noted. Correlation age, length, investigated...

10.1111/cxo.12254 article EN Clinical and Experimental Optometry 2015-06-23

This study was designed to compare the normal and glaucomatous eyes regarding retinal nerve fiber layer (RNFL) thickness peripapillary choroidal (PCT), investigate correlation of RNFL PCT.Subjects were selected as a convenience sample those from tertiary referral practice glaucoma. Thirty-two accepted group 1; 30 2. Groups compared for PCT. Correlations PCT assessed each location.Mean inferior superior in 1 significantly lower than control group; mean thicknesses temporal nasal quadrants not...

10.3109/08820538.2016.1139736 article EN Seminars in Ophthalmology 2016-07-01

To describe the clinical and refractive outcomes of Yamane transconjunctival sutureless intrascleral intraocular lens (SIS IOL) fixation technique in aphakic dislocated IOLs.The IOL dispositioned patients who underwent surgery Bozyaka Research Training Hospital were evaluated retrospectively. The demographic data, preoperative & postoperative best-corrected visual acuity (BCVA), spherical equivalent (SE), indication for surgery, additional surgical interventions, complications, final status...

10.1177/11206721231167198 article EN European Journal of Ophthalmology 2023-04-10

To investigate the correlation of choroidal thickness with outer and inner retinal layers.A retrospective OCT scan review was conducted for healthy patients. Choroidal, layer, layer thicknesses were measured at fovea 500 μm, 1,000 1,500 μm temporal nasal to fovea. Retinal also foveal center. Choroidal (CT) compared different locations, CT layers examined.Mean thinnest nasally, thicker in subfoveal region, then thinner again temporally. Correlations found between points slightly higher than...

10.3928/23258160-20131015-01 article EN Ophthalmic surgery, lasers & imaging retina 2013-11-25

Purpose: To investigate whether macular anatomic structure and afferent visual system function differ among amblyopic eyes, non-amblyopic fellow controls, using spectral-domain optical coherence tomography (SD-OCT), pupil cycle time (PCT).Methods: This observational, cross-sectional study included 30 patients with unilateral amblyopia healthy subjects. Optical (OCT) (PCT) were used to evaluate compared their eyes age- gender-matched (30 participants). The separated into two groups:...

10.1080/02713683.2017.1349153 article EN Current Eye Research 2017-11-09
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