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Eye biometry

Yanin Suwan, Sunpong Jiamsawad, Wasu Supakontanasan, Chaiwat Teekhasaenee
BACKGROUND: To evaluate the mechanisms of acute angle-closure (AAC) other than the pupillary block using ultrasound biomicroscopy DESIGN: Retrospective chart review. PARTICIPANTS: All patients who were diagnosed with AAC in Ramathibodi Hospital, Bangkok, Thailand, between June 2011 and February 2015 were enrolled. METHODS: 72 patients who were diagnosed with AAC underwent a detailed ocular examination. The diagnosed mechanism of AAC was confirmed by UBM and ocular biometry...
October 22, 2016: Clinical & Experimental Ophthalmology
Manuel Garza-Leon, Hugo A Fuentes-de la Fuente, Ana V García-Treviño
PURPOSE: The purpose of the study was to assess the reproducibility of ocular biometry using the IOLMaster-700 in a healthy population. METHODS: This is a prospective, cross-sectional, observational reproducibility study. Ocular biometry was performed three times on each of 45 studied eyes. Flattest meridian (Kf) and the steepest meridian (Ks), central corneal thickness, axial length, anterior chamber depth, aqueous depth, lens thickness, and white-to-white distances were recorded...
October 21, 2016: International Ophthalmology
Xiaohong Liu, Hehua Ye, Qi Zhang, Xuan Cai, Wenjing Yu, Siyi Yu, Tianyu Wang, Wuyi Lu, Xiang Li, Peiquan Zhao
BACKGROUND: Myopia subjects usually have long axial lengths and are predisposed to deep anterior chamber depths and open angles. Jiangning eye study is a randomized, population based study in Shanghai to determine whether myopia has an effect on the prevalence of occludable angles. METHODS: A total of 2478 residents aged 50 years and over were randomly selected, and 2044 (82.5%) individuals of them participated in ophthalmic examinations between November 2012 and February 2013...
2016: PloS One
Nir Sorkin, Amir Rosenblatt, Irina S Barequet
PURPOSE: To compare measurements of axial length (AL), anterior chamber depth (ACD), keratometry (K), and the refractive predictability of the Aladdin and IOLMaster biometry devices in cataract surgery patients. METHODS: A retrospective observational study of eyes undergoing cataract surgery. Data were retrieved on AL, ACD, and K measurements obtained by the Aladdin and the IOLMaster. Furthermore, the postoperative refractive prediction errors were compared between the devices...
October 12, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Xiao-Hua Wu, Kang-Wei Qian, Guo-Zhong Xu, Yun-Yun Li, Yuan-Yuan Ma, Furong Huang, Yan-Qing Wang, Xiangtian Zhou, Jia Qu, Xiong-Li Yang, Yong-Mei Zhong, Shi-Jun Weng
Purpose: Although retinal dopamine (DA) has been long implicated in myopia development, current studies demonstrate that retinal DA levels are unaltered in C57BL/6 mice with form-deprivation myopia. This work was undertaken to explore whether and how refractive development is perturbed in this mouse strain when retinal DA levels are reduced by 6-hydroxydopamine (6-OHDA) administration. Methods: On two successive days, 6-OHDA was injected into the vitreous of P18 mice...
October 1, 2016: Investigative Ophthalmology & Visual Science
Seok Hyun Bae, Shin Hee Kang, Chi Shian Feng, Joohyun Park, Jae Hoon Jeong, Kayoung Yi
PURPOSE: To investigate optic nerve head size and retinal nerve fiber layer (RNFL) thickness according to refractive status and axial length. METHODS: In a cross-sectional study, 252 eyes of 252 healthy volunteers underwent ocular biometry measurement as well as optic nerve head and RNFL imaging by spectral-domain optical coherence tomography. Correlation and linear regression analyses were performed for all subjects. The magnification effect was adjusted by the modified axial length method...
October 2016: Korean Journal of Ophthalmology: KJO
Kenneth J Hoffer, Giacomo Savini
PURPOSE: To investigate agreement between the ocular biometry measurements provided by a newer optical biometer, the AL-Scan (Nidek Co, Ltd., Gamagori, Japan) and those provided by the IOLMaster 500 (Carl Zeiss Meditec, Jena Germany), which are both based on partial coherence interferometry. METHODS: Axial length, corneal power, and anterior chamber depth (corneal epithelium to lens) were measured in 86 eyes of 86 patients scheduled for cataract surgery using both biometers...
October 1, 2016: Journal of Refractive Surgery
Pelin Özyol, Erhan Özyol, Ercan Baldemir
PURPOSE: Since age-related changes in lens elasticity and ciliary muscle contractility can affect how ocular parameters respond to cycloplegia, intraocular lens (IOL) power measurements calculated by formulas using anterior chamber depth (ACD), lens thickness (LT) or white-to-white (WtW) for effective lens position prediction can vary. In response, using swept-source optical biometry in pre-presbyopic and presbyopic eyes, we investigated changes in ocular parameters and IOL power calculations due to cycloplegia...
October 1, 2016: American Journal of Ophthalmology
Oliver L Yeh, Karine D Bojikian, Mark A Slabaugh, Philip P Chen
PURPOSE: To examine refractive outcomes after phacoemulsification in eyes with prior trabeculectomy. DESIGN: Retrospective observational case-control study METHODS:: Comparison of eyes of glaucoma patients undergoing cataract surgery after trabeculectomy (study group) with a matched group with medically controlled glaucoma (control group). Laser interferometry was used to obtain ocular biometry. We measured the difference between the expected and actual postoperative refraction using third-generation and fourth-generation intraocular lens (IOL) prediction formulae (Haigis, Holladay 2, Hoffer Q, and SRK-T)...
September 21, 2016: Journal of Glaucoma
Sujata Subbiah, Philip A Thomas, C A Nelson Jesudasan
PURPOSE: To compare data on anatomical and biometric parameters, and their combination, obtained by using ultrasound biomicroscopy (UBM) and A-scan in eyes with phacomorphic glaucoma (PG) and eyes with mature cataract and to determine differences that may predispose to development of PG. METHODS: Eighty patients (80 eyes) were enrolled in this cross-sectional study. Anterior chamber parameters, namely anterior chamber depth (ACD), angle-opening distance (AOD), iris-lens contact distance (ILCD), and trabecular-ciliary process distance (TCPD), among other parameters, were assessed by UBM (35 MHz), while axial length (AL) and lenticular thickness (LT) were determined by A-scan biometry...
September 13, 2016: International Ophthalmology
Ali Sadrinejad, Hossein Khara, Majid Gudarzi
To investigate the health status, the parasite diversity and abundance were studied in three pike populations. For this purpose, totally 90 fish were caught from three natural habitats of pike including Chamkhale River, Anzali and Amirkelayeh wetlands, Iran. After biometry and age determination, fish were dissected and parasites were investigated in intestine, gill and eye. According to results, five parasite species were identified in whole body of pikes including Eustrongylides exises, Raphidascaris acus and Triaeophorus crassus in intestine, Tetraonchus monenteron in gill and Diplostomum spathaceum in eye...
September 2016: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
Louise Terry, Nicola Cassels, Kelly Lu, Jennifer H Acton, Tom H Margrain, Rachel V North, James Fergusson, Nick White, Ashley Wood
Retinal and intra-retinal layer thicknesses are routinely generated from optical coherence tomography (OCT) images, but on-board software capabilities and image scaling assumptions are not consistent across devices. This study evaluates the device-independent Iowa Reference Algorithms (Iowa Institute for Biomedical Imaging) for automated intra-retinal layer segmentation and image scaling for three OCT systems. Healthy participants (n = 25) underwent macular volume scans using a Cirrus HD-OCT (Zeiss), 3D-OCT 1000 (Topcon), and a non-commercial long-wavelength (1040nm) OCT on two occasions...
2016: PloS One
Ahmet Kirgiz, Kurşat Atalay, Havva Kaldirim, Kubra Serefoglu Cabuk, Mehmet Orcun Akdemir, Muhittin Taskapili
The purpose of this study was to compare the keratometry (K) values obtained by the Scheimpflug camera combined with placido-disk corneal topography (Sirius) and optical biometry (Lenstar) for intraocular lens (IOL) power calculation before the cataract surgery, and to evaluate the accuracy of postoperative refraction. 50 eyes of 40 patients were scheduled to have phacoemulsification with the implantation of a posterior chamber intraocular lens. The IOL power was calculated using the SRK/T formula with Lenstar K and K readings from Sirius...
September 1, 2016: International Ophthalmology
Hassan Hashemi, Mehdi Khabazkhoob, Mohammad Hassan Emamian, Abbasali Yekta, Ali Jafari, Payam Nabovati, Akbar Fotouhi
PURPOSE: To determine upper eyelid ptosis prevalence and some related factors in 44- to 69-year-olds of Shahroud in the north of Iran. METHODS: In 2009, using multi-stage cluster sampling, 300 clusters of 40-64-year-olds were selected in Shahroud city, and all 5190 participants were invited to be re-examined in 5 years (2014). The current report is the second phase of the study in which 4737 (91.3%) people participated and underwent vision tests, slit lamp examination, biometry, and ophthalmoscopy in 2014...
September 2016: Journal of Current Ophthalmology
Jia-Kang Wang, Shu-Wen Chang
The aim of this study was to compare the refractive errors after uneventful phacoemulsification and intraocular lens implantation in the cases of vitrectomized eyes and non-vitrectomized eyes. Vitrectomized eyes were divided into 2 groups: vitrectomy alone as Group 1, vitrectomy with gas tamponade as Group 2. Normal-controlled eyes were categorized as Group 3. Intraocular lens (IOL) power calculation and the measurements of axial length (AL) and keratometric value (K) were performed using the IOLMaster and the Haigis and SRK/T formula as subgroup A and B...
August 25, 2016: International Ophthalmology
Bharkbhum Khambhiphant, Suganlaya Sasiwilasagorn, Nattida Chatbunchachai, Krit Pongpirul
PURPOSE: The purpose of this study was to evaluate the effect of pupillary dilation on the Haigis formula-calculated intraocular lens (IOL) power and ocular biometry measurements by using IOLMaster(®). METHODS: A prospective study was performed for biometry measurements of 373 eyes of 192 healthy subjects using the IOLMaster at the outpatient department of King Chulalongkorn Memorial Hospital from February 2013 to July 2013. The axial length (AL), anterior chamber depth (ACD), keratometry (K), and IOL power were measured before and after 1% tropicamide eye drop instillation...
2016: Clinical Ophthalmology
Nasrin Moghadas Sharif, Nasser Shoeibi, Asieh Ehsaei, Edward A H Mallen
PURPOSE: The purpose of this study was to compare retinal thickness and biometric parameters between highly myopic eyes with and without tilted optic discs. METHODS: A total of 60 eyes from 60 highly myopic individuals (defined as a mean spherical equivalent refraction of -6.00 D or greater and axial length ≥26 mm) underwent detailed ophthalmic examination. Twenty-one eyes (13 females and 8 males; mean age: 29 ± 7 years) with tilted optic discs were recruited and compared with 39 eyes (23 females and 16 males; mean age: 28 ± 6 years) of control subjects without tilted optic discs using spectral domain optical coherence tomography (OCT) and the Lenstar biometer...
August 22, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Jung-Hoon Kim, Moosang Kim, Seung-Jun Lee, Sang Beom Han, Young Tae Kong, Hee Kyung Yang, Joon Young Hyon
BACKGROUND: To evaluate the relationship between age, axial length (AL), anterior chamber depth (ACD) and corneal steepness (K) in patients with cataract. METHODS: In this retrospective study, medical records of 800 patients (800 eyes) who were diagnosed with cataract and received preoperative ophthalmologic examination were reviewed. Data including age, gender and ocular biometric data including AL, ACD and K were collected and analyzed using univariate and multivariate analyses...
2016: BMC Ophthalmology
Ehud Zamir, George Y X Kong, Tanya Kowalski, Michael Coote, Ghee Soon Ang
PURPOSE: We hypothesize that: (1) Anterior chamber depth (ACD) is correlated with the relative anteroposterior position of the pupillary image, as viewed from the temporal side. (2) Such a correlation may be used as a simple quantitative tool for estimation of ACD. METHODS: Two hundred sixty-six phakic eyes had lateral digital photographs taken from the temporal side, perpendicular to the visual axis, and underwent optical biometry (Nidek AL scanner). The relative anteroposterior position of the pupillary image was expressed using the ratio between: (1) lateral photographic temporal limbus to pupil distance ("E") and (2) lateral photographic temporal limbus to cornea distance ("Z")...
July 2016: Translational Vision Science & Technology
Wen Jun Jiang, Hui Wu, Jian Feng Wu, Yuan Yuan Hu, Tai Liang Lu, Wei Sun, Da Dong Guo, Xing Rong Wang, Hong Sheng Bi, Jost B Jonas
BACKGROUND: To assess the corneal diameter and its associations in children. DESIGN: Cross-sectional school-based study. PARTICIPANTS: The Shandong Children Eye Study included 6026 children aged 4-18 years. METHODS: Horizontal corneal diameter was measured by laser interferometry based ocular biometry. MAIN OUTCOME MEASURES: Horizontal corneal diameter. RESULTS: Corneal diameter measurements were available for 5970 (99...
August 16, 2016: Clinical & Experimental Ophthalmology
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