Researcher:
Aydındoğan, Güneş

Profile Picture
ORCID

Job Title

Researcher

First Name

Güneş

Last Name

Aydındoğan

Name

Name Variants

Aydındoğan, Güneş

Email Address

Birth Date

Filters

2017 - 201912020 - 20213

Advanced Search

Filter by

Settings

Researcher Of Publications: search.filters.isAuthorOfPublication.92b41bbf-2140-4915-be49-b874b8f00004

Search Results

Now showing 1 - 4 of 4
  • Placeholder
    PublicationMetadata only
    Vision simulator for cataract screening using holographic near-eye display with pupil tracker
    (Association for Research in Vision and Ophthalmology (ARVO), 2021) N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; N/A; Department of Electrical and Electronics Engineering; N/A; Kavaklı, Koray; Aydındoğan, Güneş; Şahin, Afsun; Ürey, Hakan; PHD Student; Researcher; Faculty Member; Faculty Member; Department of Electrical and Electronics Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); College of Engineering; College of Engineering; School of Medicine; College of Engineering; N/A; N/A; N/A; 171267; 8579
  • Thumbnail Image
    PublicationOpen Access
    Pupil steering holographic display for pre-operative vision screening of cataracts
    (Optica Publishing Group, 2021) Ulusoy, Erdem; Department of Electrical and Electronics Engineering; Kavaklı, Koray; Aydındoğan, Güneş; Kesim, Cem; Hasanreisoğlu, Murat; Şahin, Afsun; Ürey, Hakan; Teaching Faculty; Faculty Member; Faculty Member; Faculty Member; Department of Electrical and Electronics Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Graduate School of Sciences and Engineering; School of Medicine; College of Engineering; Koç University Hospital; N/A; N/A; N/A; 182001; 171267; 8579
    Cataract is the most common cause of preventable blindness and vision loss where the only treatment is surgical replacement of the natural lens with an intraocular lens. Computergenerated holography (CGH) enables to control phase, size, and shape of the light beam entering through the eye-pupil. We developed a holographic vision simulator to assess visual acuity for patients to experience the postoperative corrected vision before going through surgery. A holographically shaped light beam is directed onto the retina using small non-cataractous regions of the lens with the help of a pupil tracker. A Snellen chart hologram is shown to subjects at desired depth with myopia and hyperopia correction. Tests with 13 patients demonstrated substantial improvements in visual acuity and the simulator results are consistent with the post-operative vision tests. Holographic simulator overperforms the existing vision simulators, which are limited to static pinhole exit pupils and incapable of correcting aberrations.
  • Thumbnail Image
    PublicationOpen Access
    Asymmetric Rosen-Zener-like transition through a soliton-surface-plasmon photonic Josephson junction with spatially varying coupling
    (American Physical Society (APS), 2017) Department of Physics; Güven, Kaan; Aydındoğan, Güneş; Faculty Member; Department of Physics; College of Sciences; 52290; N/A
    The transition dynamics of photons between an optical soliton in a nonlinear dielectric waveguide and a spatially coupled surface-plasmon excitation on a parallel flat metal surface can be formulated in analogy to that of a Josephson junction of two-level (double-well) Bose-Einstein condensates, albeit with a nonlinear coupling that inherently depends on the population imbalance of the levels. The present work demonstrates that asymmetric Rosen-Zener-like transitions can be obtained through this optical Josephson junction, by turning on and off the coupling across a hyperbolically varying separation between the soliton and the surface-plasmon. The transitions can generate full population transfer, population splitting, or merging between the quasistationary initial and final states, which are defined by a fixed population imbalance in the decoupled limit. Transitions from a pure soliton or pure surface-plasmon initial state are found to be robust against the relative phase, whereas the transitions from an initial state with mixed population depend strongly on the relative phase. The soliton-surface-plasmon system also bears similarities to the spatially coupled optical waveguides which are introduced further as the classical analogs of the spatial adiabatic passage and stimulated Raman adiabatic passage mechanisms in quantum and atom optics.
  • Thumbnail Image
    PublicationOpen Access
    Applications of augmented reality in ophthalmology [invited]
    (Optical Society of America (OSA), 2021) Artal, Pablo; Department of Physics; Department of Electrical and Electronics Engineering; Aydındoğan, Güneş; Kavaklı, Koray; Ürey, Hakan; Şahin, Afsun; Faculty Member; Faculty Member; Department of Physics; Department of Electrical and Electronics Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Graduate School of Sciences and Engineering; College of Engineering; School of Medicine; N/A; N/A; 8579; 171267
    Throughout the last decade, augmented reality (AR) head-mounted displays (HMDs) have gradually become a substantial part of modern life, with increasing applications ranging from gaming and driver assistance to medical training. Owing to the tremendous progress in miniaturized displays, cameras, and sensors, HMDs are now used for the diagnosis, treatment, and follow-up of several eye diseases. In this review, we discuss the current state-of-the-art as well as potential uses of AR in ophthalmology. This review includes the following topics: (i) underlying optical technologies, displays and trackers, holography, and adaptive optics; (ii) accommodation, 3D vision, and related problems such as presbyopia, amblyopia, strabismus, and refractive errors; (iii) AR technologies in lens and corneal disorders, in particular cataract and keratoconus; (iv) AR technologies in retinal disorders including age-related macular degeneration (AMD), glaucoma, color blindness, and vision simulators developed for other types of low-vision patients.