Results 1 to 10 of about 918 (201)

Accuracy and precision of a sphero‐cylindrical over‐refraction app for smartphones

Ophthalmic and Physiological Optics, Volume 45, Issue 7, Page 1662-1675, November 2025.
Abstract Purpose To evaluate the accuracy and precision of a web‐based smartphone app designed to measure sphero‐cylindrical over‐refraction. Methods A total of 307 healthy young subjects (22.5 ± 3.4 years) underwent clinical subjective refraction. In addition to each subject's refractive correction, spherical and cylindrical errors from −1.50 to 0.00 ...
Rosa Maria Salmeron‐Campillo, Gines Martinez‐Ros, Jose Angel Diaz‐Guirado, Carmen Travel‐Alarcon, Mateusz Jaskulski, Norberto Lopez‐Gil   +5 more
wiley   +1 more source

Deep Learning–Based Prediction of Refractive Error Using Photorefraction Images Captured by a Smartphone: Model Development and Validation Study

JMIR Medical Informatics, 2020
BackgroundAccurately predicting refractive error in children is crucial for detecting amblyopia, which can lead to permanent visual impairment, but is potentially curable if detected early.
Chun, Jaehyeong, Kim, Youngjun, Shin, Kyoung Yoon, Han, Sun Hyup, Oh, Sei Yeul, Chung, Tae-Young, Park, Kyung-Ah, Lim, Dong Hui   +7 more
doaj   +1 more source

Calibration of the PlusOptix PowerRef 3 with change in viewing distance, adult age and refractive error

Ophthalmic and Physiological Optics, Volume 39, Issue 4, Page 253-259, July 2019., 2019
Abstract Purpose The PowerRef 3 is frequently used in studying the near triad of accommodation, vergence and pupil responses in normal and clinical populations. Within a range, the defocus measurement of the PowerRef 3 is linearly related to the eye's defocus. While the default factory‐calibrated slope of this relation (calibration factor) is 1, it has
Saeideh Ghahghaei, Olivia Reed, T Rowan Candy, Arvind Chandna   +3 more
wiley   +1 more source

Photorefractive acoustoelectro-optic correlator [PDF]

Optics Letters, 1987
An optical correlator based on acoustoelectro-optic interaction is proposed. The device is experimentally demonstrated with a LiNbO(3) crystal in which acoustic waves are launched by a piezoelectric transducer and electric fields are established through the photorefractive effect.
PSALTIS, D., LEE, H.
openaire   +3 more sources

Drive-by Photoscreening: Plusoptix, 2WIN and Blinq Amblyopia Detection During the COVID-19 Pandemic

Clinical Ophthalmology, 2021
Mason Keffalos,1 Samuel Martin,2 Robert Arnold2 1Boise State University, Boise, ID, USA; 2Alaska Blind Child Discovery, Anchorage, AK, USACorrespondence: Robert ArnoldAlaska Blind Child Discovery, Alaska Children’s EYE & Strabismus, 3500 ...
Keffalos M, Martin S, Arnold R
doaj  

Delayed-onset bilateral abducens paresis after head trauma

Indian Journal of Ophthalmology, 2012
Bilateral sixth nerve paresis following closed head injury, though rare, is a known entity. However, delayed-onset post-traumatic bilateral abducens paresis is extremely rare. We present two cases.
Pravin Salunke, Amey Savardekar, Sukumar Sura   +2 more
doaj   +1 more source

Recommended practices for vision screening in pre‐school‐age children: A 2025 update

Optometry and Vision Science, Volume 102, Issue 10, Page 589-595, October 2025.
SIGNIFICANCE: Despite significant evidence supporting the utility of vision screening for identifying children who need further evaluation by an eye care professional, there is considerable variability in screening guidelines along with a lack of consensus for monitoring and reporting outcomes.
Yi Pang, Stacy A. Lyons, P. Kay Nottingham Chaplin, Sandra S. Block, Donna Fishman, Elise B. Ciner, on behalf of the Advisory Committee to the National Center for Children’s Vision and Eye Health at Prevent Blindness, Megan Collins, Rachel (Stacey) Anastasia Coulter, Afua Asare, Sofia Vargas Baucom, Sandra S. Block, Geoffrey Bradford, Elise Ciner, Danielle Crull, Carolyn (Carey) Drews‐Botsch, E. Eugenie Hartmann, Alex R. Kemper, Stephanie Klas, Phoebe Lenhart, Stacy Ayn Lyons, Marie Y. Mann, Lynne P. Meadows, Olachi Mezu‐Ndubuisi, Wanda Montalvo, Bruce Moore, Kathy O’Connor, Yi Pang, Millicent Peterseim, Nicole Pratt, Jean E. Ramsey, Michael X. Repka, Donny Suh, Shanyn Toulouse   +33 more
wiley   +1 more source

Dynamic distance direct ophthalmoscopy, a novel technique to assess accommodation in children

Indian Journal of Ophthalmology, 2012
Aim: To describe and compare dynamic distance direct ophthalmoscopy (DDDO) with dynamic retinoscopy (DR) in assessment of accommodation in children. Materials and Methods: This prospective observational study had four components.
Mihir Kothari, Suvarna Balankhe, Shalaka Paralkar, Deepali Nar, Shreya Bhagat, Shashank Ranade   +5 more
doaj   +1 more source

Synaptic Function in Memristor Devices for Neuromorphic Circuit Applications

Advanced Electronic Materials, Volume 11, Issue 14, September 4, 2025.
Discover how neuromorphic devices mimic brain‐like learning: this article explores how ionic and electronic conduction processes enable artificial synapses to adapt across time scales. Uncover the essential ingredients—state‐variable dynamics, rectification, and memory—and how they can be probed through nonlinear diagnostics to engineer smarter, more ...
Juan Bisquert, Wooyoung Shim, So‐Yeon Kim, Bernabe Linares‐Barranco   +3 more
wiley   +1 more source

Nonvolatile storage in photorefractive crystals [PDF]

Optics Letters, 1994
We propose and demonstrate a nonvolatile holographic recording system for storing two-dimensional images. The readout light in this system is not absorbed by the holographic medium, and the data are preformatted or postformatted so that lines from different holograms are interleaved to satisfy the Bragg-matching condition.
MOK, F., LI, H.Y.S., PSALTIS, D.
openaire   +3 more sources