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https://www.readbyqxmd.com/read/29676308/correlation-between-dry-eye-and-refractive-error-in-saudi-young-adults-using-noninvasive-keratograph-4
#1
Rania M Fahmy, Amal Aldarwesh
Purpose: The purpose is to study the correlation between dry eye and refractive errors in young adults using noninvasive Keratograph. Methods: In this cross sectional study, a total of 126 participants in the age range of 19-25 years and who were free of ocular surface disease, were recruited from King Saud University Campus. Refraction was defined by the spherical equivalent (SE) as the following: 49 emmetropic eyes (±0.50 SE), 48 myopic eyes (≤-0.75 SE and above), and 31 hyperopic eyes (>+0...
May 2018: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29669369/cataract-surgery-in-high-hyperopia
#2
Nicolas Philipp Waldmann, Nadine Gerber, Warren Hill, David Goldblum
BACKGROUND: Although cataract surgery is a well-established and standardised procedure, it can be demanding and associated with higher complication rates in high hyperopia. We present clinical data for highly hyperopic patients who underwent cataract surgery over a 12-year period (2005 - 2016) and at a single centre. PATIENTS AND METHODS: Out of a total of 11 434 cataract operations, 41 highly hyperopic eyes (SN60AT ≥ 31 dpt) were included for analysis...
April 2018: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29655781/the-hyperopic-effect-of-narrow-band-long-wavelength-light-in-tree-shrews-increases-non-linearly-with-duration
#3
Alexander H Ward, Thomas T Norton, Carrie E Huisingh, Timothy J Gawne
During postnatal refractive development, an emmetropization mechanism uses refractive error to modulate the growth rate of the eye. Hyperopia (image focused behind the retina) produces what has been described as "GO" signaling that increases growth. Myopia (image focused in front of the retina) produces "STOP" signaling that slows growth. The interaction between GO and STOP conditions is non-linear; brief daily exposure to STOP counteracts long periods of GO. In young tree shrews, long-wavelength (red) light, presented 14 h per day, also appears to produce STOP signals...
April 12, 2018: Vision Research
https://www.readbyqxmd.com/read/29627298/effect-of-distance-vision-and-refractive-error-on-the-spontaneous-eye-blink-activity-in-human-subjects-in-primary-eye-gaze
#4
Michael J Doughty
PURPOSE: To evaluate whether visual target character and visibility affects spontaneous eye blink rate (SEBR) in primary eye gaze and silence. METHODS: Video recordings were made of young healthy adults who were either emmetropic (n=32) or who wore spectacles for refractive error (range -4.75D and +4.50D (n=31). Emmetropes had 5min recordings made whilst seated and looking towards a distant whiteboard. For spectacle wearers, recordings were made whilst looking towards the whiteboard with a 35mm sized cross, and repeated after spectacle removal...
April 4, 2018: Journal of Optometry
https://www.readbyqxmd.com/read/29625482/distribution-pattern-of-choroidal-thickness-at-the-posterior-pole-in-chinese-children-with-myopia
#5
Junjie Deng, Xiaoli Li, Jiali Jin, Bo Zhang, Jianfeng Zhu, Haidong Zou, Xun Xu, Jingbo Xie, Ling Wang, Shaopin Zhu, Xiangui He
Purpose: To determine the relationship between choroidal thickness (ChT) at the posterior pole and refractive error and to explore the difference between the macular and peripapillary regions in children with myopia. Methods: A total of 340 healthy Chinese children underwent a series of comprehensive ocular examinations including cycloplegic refraction. Swept-source optical coherence tomography was used to measure the ChT in the macular and peripapillary regions...
March 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29624544/differences-in-refractive-outcomes-between-phacoemulsification-for-cataract-alone-and-combined-phacoemulsification-and-vitrectomy-for-epiretinal-membrane
#6
Lynn Shi, Jonathan S Chang, Leejee H Suh, Stanley Chang
PURPOSE: To determine whether preoperative adjustments are required for intraocular lens calculations in combined phacovitrectomy surgery. METHODS: A single-center, retrospective study of 50 eyes that underwent combined phacovitrectomy and a control group of 50 eyes after cataract surgery over a 3-year period by a single anterior segment surgeon and a single posterior segment surgeon. Main outcome measures were predicted refractive error (RE), as determined by SRK/T and Holladay 1 formulas, change compared with actual RE, surgically induced astigmatism, and the relationships between preoperative central foveal thickness or change in central foveal thickness and final RE...
April 5, 2018: Retina
https://www.readbyqxmd.com/read/29616154/higher-order-aberrations-following-hyperopia-treatment-small-incision-lenticule-extraction-laser-assisted-in-situ-keratomileusis-and-lenticule-implantation
#7
Yu-Chi Liu, Jiaxin Wen, Ericia Pei Wen Teo, Geraint P Williams, Nyein Chan Lwin, Jodhbir S Mehta
Purpose: To compare the postoperative higher-order-aberrations (HOAs) after hyperopic small incision lenticule extraction (SMILE), hyperopic laser-assisted in situ keratomileusis ( LASIK), and lenticule implantation for correction of hyperopia. Methods: Eighteen monkeys were divided to six groups: +2.00 D and +4.00 D hyperopic SMILE, +2.00 D and +4.00 D hyperopic LASIK ( n = 6 eyes for each), and lenticule implantation with a -2.00 D and -4.00 D lenticule ( n = 3 eyes for each)...
April 2018: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/29615113/intraocular-lens-power-calculation-for-the-equine-eye
#8
Ulrike Meister, Christiane Görig, Christopher J Murphy, Hubertus Haan, Bernhard Ohnesorge, Michael H Boevé
BACKGROUND: Phacoemulsification and intraocular lens (IOL) implantation during cataract surgery in horses occur with increasing frequency. To reduce the postoperative refractive error it is necessary to determine the proper IOL power. In the present study retinoscopy, keratometry and ultrasonographic biometry were performed on 98 healthy equine eyes from 49 horses. The refractive state, corneal curvature (keratometry) and the axial location of all optical interfaces (biometry) were measured...
April 3, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29603938/impact-of-intraocular-lens-displacement-on-the-fixation-axis
#9
Simon Schröder, Jens Schrecker, Loay Daas, Timo Eppig, Achim Langenbucher
To investigate the impact of intraocular lens (IOL) decentration ≤±1  mm and IOL tilt ≤±10° on the fixation axis and spherical equivalent refraction (SE), 50 pseudo-phakic eyes were simulated using numerical ray-tracing. We computed the position of the object point whose image ends up at the virtual fovea for each scenario and estimated the corresponding change of fixation axis and SE. The eye turned opposite to the direction of IOL decentration or tilt to compensate for the associated prismatic effect (angle <1...
April 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29603855/five-year-refractive-changes-in-a-rural-chinese-adult-population-and-its-related-factors-the-handan-eye-etudy
#10
Shi-Ming Li, Caixia Lin, Yue Wan, Kai Cao, Jie Hao, Ye Zhang, Ailian Hu, Jian Wu, David S Friedman, Ningli Wang
IMPORTANCE: Provision of refractive changes is important to predict eyecare needs for aging population. BACKGROUND: To provide 5-year refractive changes in a rural Chinese adult population. DESIGN: Population-based longitudinal study. PARTICIPANTS: At baseline, 6830 subjects aged 30+ years took part in the Handan Eye study. 5394 of the 6323 survivors (85.3%) participated in the 5-year follow-up. METHODS: Ocular examinations including standardized refraction were performed according to the same protocol at both baseline and follow-up...
March 30, 2018: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/29590157/hyperopic-refractive-correction-by-lasik-smile-or-lenticule-reimplantation-in-a-non-human-primate-model
#11
Geraint P Williams, Benjamin Wu, Yu Chi Liu, Ericia Teo, Chan L Nyein, Gary Peh, Donald T Tan, Jodhbir S Mehta
Hyperopia is a common refractive error, apparent in 25% of Europeans. Treatments include spectacles, contact lenses, laser interventions and surgery including implantable contact lenses and lens extraction. Laser treatment offers an expedient and reliable means of correcting ametropia. LASIK is well-established however SMILE (small-incision lenticule extraction) or lenticule implantation (derived from myopic laser-correction) are newer options. In this study we compared the outcomes of hyperopic LASIK, SMILE and lenticule re-implantation in a primate model at +2D/+4D treatment...
2018: PloS One
https://www.readbyqxmd.com/read/29576882/effect-of-atropine-eye-drops-on-choroidal-thinning-induced-by-hyperopic-retinal-defocus
#12
Samuel T-H Chiang, John R Phillips
Purpose: To investigate the effects of atropine on choroidal thinning induced by hyperopic retinal defocus. Methods: Ten young adults with myopia (-1.00 D to -5.00 D) viewed a video at 6 metres for 60 minutes on successive days. On day 1, one eye (control) was distance corrected with a contact lens; the other (experimental) eye wore a contact lens imposing 2.00 D of hyperopic retinal defocus. Sub- and perifoveal choroidal thickness (SFCT, PFCT) were monitored with optical coherence tomography...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29573985/accommodation-and-age-dependent-eye-model-based-on-in-vivo-measurements
#13
Juan F Zapata-Díaz, Hema Radhakrishnan, W Neil Charman, Norberto López-Gil
PURPOSE: To develop a flexible model of the average eye that incorporates changes with age and accommodation in all optical parameters, including entrance pupil diameter, under photopic, natural, environmental conditions. METHODS: We collated retrospective in vivo measurements of all optical parameters, including entrance pupil diameter. Ray-tracing was used to calculate the wavefront aberrations of the eye model as a function of age, stimulus vergence and pupil diameter...
March 21, 2018: Journal of Optometry
https://www.readbyqxmd.com/read/29567041/refractive-error-magnitude-and-variability-relation-to-age
#14
Elizabeth L Irving, Carolyn M Machan, Sharon Lam, Patricia K Hrynchak, Linda Lillakas
PURPOSE: To investigate mean ocular refraction (MOR) and astigmatism, over the human age range and compare severity of refractive error to earlier studies from clinical populations having large age ranges. METHODS: For this descriptive study patient age, refractive error and history of surgery affecting refraction were abstracted from the Waterloo Eye Study database (WatES). Average MOR, standard deviation of MOR and astigmatism were assessed in relation to age...
March 19, 2018: Journal of Optometry
https://www.readbyqxmd.com/read/29561350/sulfur-hexafluoride-20-versus-air-100-for-anterior-chamber-tamponade-in-dmek-a-meta-analysis
#15
Raquel Esteves Marques, Paulo Silva Guerra, David Cordeiro Sousa, Nuno Pinto Ferreira, Ana Inês Gonçalves, Ana Miguel Quintas, Walter Rodrigues
PURPOSE: To compare intracameral 20% sulfur hexafluoride (SF6) versus 100% air as tamponade for graft attachment in Descemet membrane endothelial keratoplasty (DMEK). METHODS: Using an electronic database search on MEDLINE and CENTRAL from inception to December 2017, we performed a literature review and meta-analysis including all comparative studies of SF6 at a 20% concentration (20% SF6) versus pure air (100% air) for anterior chamber tamponade in DMEK. The primary outcome was the rebubbling rate at the final observation...
March 20, 2018: Cornea
https://www.readbyqxmd.com/read/29554388/high-definition-optical-coherence-tomography-of-the-macula-in-deprivational-amblyopia
#16
Christiane Al-Haddad, Carl-Joe Mehanna, Karine Ismail
BACKGROUND AND OBJECTIVE: This study evaluated macular thickness in deprivational amblyopia and compared it to matched controls. PATIENTS AND METHODS: The authors present a cross-sectional study of patients with amblyopia from pediatric cataract and matched controls. Macular high-definition optical coherence tomography scans of each eye were acquired. Central macular thickness (CMT) and parafoveal thicknesses at 500 μm, 1,000 μm, and 1,500 μm in the nasal, temporal, inferior, and superior locations were measured...
March 1, 2018: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29545415/association-of-low-birth-weight-with-myopic-refractive-error-and-lower-visual-acuity-in-adulthood-results-from-the-population-based-gutenberg-health-study-ghs
#17
Achim Fieß, Alexander Karl-Georg Schuster, Stefan Nickels, Heike M Elflein, Andreas Schulz, Manfred E Beutel, Maria Blettner, Norbert Pfeiffer
PURPOSE: Low birth weight (BW) is linked to impaired organ development in childhood, including altered ocular morphological and functional development. The aim of this study was to evaluate whether low BW has long-term effects on visual acuity and refraction in adulthood. METHODS: The Gutenberg Health Study is a population-based, observational cohort study in Germany, including 15 010 participants aged between 35 and 74 years. These participants were divided into three different BW groups (low: <2500 g; normal: between 2500 and 4000 g; and high: >4000 g)...
March 15, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29535498/reference-values-for-anterior-chamber-morphometrics-with-swept-source-optical-coherence-tomography-in-a-caucasian-population
#18
Hellen Cs Römkens, Henny Jm Beckers, Jan Sag Schouten, Tos Tjm Berendschot, Carroll Ab Webers
Purpose: The aim of this study is to generate reference values for anterior chamber morphometrics to facilitate the interpretation of anterior chamber images acquired with swept-source optical coherence tomography (SS-OCT) in a Caucasian population. Materials and methods: Non-glaucomatous Caucasian subjects, who were newly referred to the outpatient department of the University Eye Clinic Maastricht UMC+, were asked to undergo anterior segment assessment with SS-OCT imaging prior to routine eye examination (including visual acuity and refractive error measurements, Goldmann applanation tonometry, slit lamp examination and funduscopy)...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29527011/space-flight-associated-neuro-ocular-syndrome-sans
#19
REVIEW
Andrew G Lee, Thomas H Mader, C Robert Gibson, Tyson J Brunstetter, William J Tarver
Interesting novel and somewhat perplexing physiologic and pathologic neuro-ocular findings have been documented in astronauts during and after long duration space flight (LDSF). These findings collectively have been termed the "space flight-associated neuro-ocular syndrome" (SANS). The National Aeronautics and Space Administration (NASA) in the United States has meticulously and prospectively documented the clinical, ultrasound, optical coherence tomography imaging, and radiographic findings of SANS including unilateral and bilateral optic disc edema, globe flattening, choroidal and retinal folds, hyperopic refractive error shifts, and nerve fiber layer infarcts (i...
March 12, 2018: Eye
https://www.readbyqxmd.com/read/29522225/the-sensitivity-of-clinical-outcomes-to-centration-on-the-light-constricted-pupil-for-a-shape-changing-corneal-inlay
#20
Enrique Barragán-Garza, Douglas D Koch, Luis G Vargas, Alan Lang, Adam Roy
PURPOSE: To assess the clinically acceptable range of inlay decentration with respect to the light-constricted pupil center and the coaxially sighted corneal light reflex (CSCLR) for an inlay (Raindrop Near Vision Inlay; ReVision Optics, Inc., Lake Forest, CA) that reshapes the anterior corneal surface. METHODS: In this retrospective, observational cohort study of 115 patients with emmetropic or low hyperopic presbyopia who were implanted with a shape-changing corneal inlay, visual acuity, task performance (in good and dim light), reports of halos and glare, and satisfaction data were collected from the preoperative and 3-month postoperative examinations...
March 1, 2018: Journal of Refractive Surgery
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