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https://www.readbyqxmd.com/read/27864880/preoperative-and-postoperative-measurements-of-retinal-vessel-oxygen-saturation-in-patients-with-different-grades-of-cataracts
#1
Hui Chen, Haotian Lin, Wan Chen, Bo Zhang, Wu Xiang, Qianying Gao, Weirong Chen, Yizhi Liu
PURPOSE: To assess the retinal vessel blood oxygen saturation preoperatively and postoperatively in patients with different grades of cataracts. METHODS: This study included 40 eyes from 40 patients with senile cataracts ranging from grade 1 to 3. All 40 eyes received standard phacoemulsification and intraocular lens implantation. The mean retinal arterial and venular oxygen saturation (SO2 ) levels were measured using the Oxymap system prior to, immediately after and 3 months after cataract surgery...
November 19, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27807947/retinal-oxygen-saturation-in-chinese-adolescents
#2
Xue Liu, Shuang Wang, Yi Liu, Li Juan Liu, Yan Yun Lv, Ping Tang, Jost B Jonas, Liang Xu
PURPOSE: To study the retinal oxygen saturation in normal eyes of Chinese adolescents. METHODS: Performing retinal oximetry with the Oxymap T1 Retinal Oximeter in healthy children and adolescents (aged 5-18 years old), we measured the arterial (SaO2 ) and venular (SvO2 ) oxygen saturation and the arteriovenous difference in oxygen saturation (Sa-vO2 ). RESULTS: The study included 122 individuals with a mean age of 13.0 ± 2.9 years (range: 5-18 years) and a mean refractive error of -3...
November 3, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27486303/inter-eye-comparison-of-retinal-oximetry-and-vessel-caliber-between-eyes-with-asymmetrical-glaucoma-severity-in-different-glaucoma-subtypes
#3
Clarissa Shu Ming Cheng, Yi Fang Lee, Charles Ong, Zhu Li Yap, Andrew Tsai, Aditi Mohla, Monisha E Nongpiur, Tin Aung, Shamira A Perera
BACKGROUND: To compare retinal vessel oxygenation and vessel caliber in primary angle-closure glaucoma (PACG), primary open-angle glaucoma (POAG), normal-tension glaucoma (NTG), and normal controls, as well as between eyes of asymmetrical glaucoma severity. METHODS: This was a prospective, cross-sectional study. The 159 subjects (PACG, n=39; POAG, n=41; NTG, n=41; normal controls, n=38) underwent retinal oxygen saturation measurements using the Oxymap T1 Retinal Oximeter, optical coherence tomography, and Humphrey visual field testing...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27434373/retinal-oximetry-in-a-healthy-japanese-population
#4
Yuki Nakano, Takeru Shimazaki, Nobuko Kobayashi, Yukiko Miyoshi, Aoi Ono, Mamoru Kobayashi, Chieko Shiragami, Kazuyuki Hirooka, Akitaka Tsujikawa
PURPOSE: To establish the normative database of retinal oximetry using Oxymap T1 in a healthy Japanese population, and study the reproducibility of the measurements in Japanese. METHODS: We measured oxygen saturation in the major retinal vessels with Oxymap T1 in 252 eyes of 252 healthy Japanese subjects. Fundus images acquired using Oxymap T1 were processed using built-in Oxymap Analyzer software. Reproducibility of retinal oximetry was investigated using 20 eyes of 20 healthy subjects...
2016: PloS One
https://www.readbyqxmd.com/read/26930659/normative-values-of-retinal-oxygen-saturation-in-rhesus-monkeys-the-beijing-intracranial-and-intraocular-pressure-icop-study
#5
Jing Li, Yiquan Yang, Diya Yang, Xiangxiang Liu, Yunxiao Sun, Shifei Wei, Ningli Wang
OBJECTIVE: To study the normal values of the retinal oxygen saturation in Rhesus monkeys and to evaluated repeatability and reproducibility of retinal oxygen saturation measurements. METHODS: Eighteen adult Rhesus macaque monkeys were included in this experimental study. An Oxymap T1 retinal oximeter (Oxymap, Reykjavik, Iceland) was used to perform oximetry on all subjects. Global arterial (SaO2) and venous oxygen saturation (SvO2), arteriovenous difference in SO2 were measured...
2016: PloS One
https://www.readbyqxmd.com/read/26840073/retinal-oximetry-with-scanning-laser-ophthalmoscope-in-infants
#6
Wouter B Vehmeijer, Vigdis Magnusdottir, Thorunn S Eliasdottir, Sveinn Hakon Hardarson, Nicoline E Schalij-Delfos, Einar Stefánsson
PURPOSE: Dual wavelength retinal oximetry has been developed for adults, but is not available for infants. Retinal oximetry may provide insight into the pathophysiology of oxygen-mediated diseases like retinopathy of prematurity. More insight in the oxygen metabolism of the retina in infants may provide valuable clues for better understanding and subsequent prevention or treatment of the disease. The measurements of oxygen saturation are obtained with two fundus images simultaneously captured in two different wavelengths of light...
2016: PloS One
https://www.readbyqxmd.com/read/26765040/perivascular-and-quadrant-nerve-fiber-layer-thickness-and-its-relationship-with-oxygen-saturation
#7
Ashwin Mohan, Supriya Dabir, Mathew Kurian, Rohit Shetty, Lavanya Chidambara, Rajesh S Kumar
PURPOSE: To study whether there exists a relationship between retinal nerve fiber layer thickness and oxygen saturation and to identify whether perivascular thickness (pRNFL) or quadrant thickness (qRNFL) has a stronger correlation. METHODS: Patients without any detectable ocular abnormality on complete ophthalmic evaluation underwent non-invasive photo-spectrometric retinal oximetry on the Oxymap T1 retinal oximeter (Oxymap hf, Reykjavik, Iceland) and spectral-domain optical coherence tomography to determine if the pRNFL (Spectralis, Heidelberg, Germany) and the qRNFL (RtVue, Optovue) correlated with the measured light intensities and the calculated retinal oxygen saturations...
September 2016: Current Eye Research
https://www.readbyqxmd.com/read/26557694/the-changes-of-retinal-saturation-after-long-term-tamponade-with-silicone-oil
#8
Bingsheng Lou, Zhaohui Yuan, Liwen He, Lixia Lin, Qianying Gao, Xiaofeng Lin
PURPOSE: To evaluate the effects of long-term tamponade with silicone oil on retinal saturation. METHODS: A total of 49 eyes that received tamponade with silicone oil were included. The patients were divided into 3 groups (3-6 months, 6-9 months, and >9 months) according to the duration of silicone oil tamponade. Retinal oximetry was performed using the Oxymap system before and 2 months after silicone oil removal. RESULTS: The mean retinal oxygen saturation before silicone oil removal was 107% ± 12% in the arterioles and 60% ± 10% in the venules, with an overall arteriovenous difference (AVD) of 47% ± 14%...
2015: BioMed Research International
https://www.readbyqxmd.com/read/26310901/the-effect-of-pars-plana-vitrectomy-and-nuclear-cataract-on-oxygen-saturation-in-retinal-vessels-diabetic-and-non-diabetic-patients-compared
#9
Martin Šín, Oldřich Chrapek, Marta Karhanová, Irena Šínová, Kareřina Špačková, Kateřina Langová, Jiří Řehák
PURPOSE: To determine the effect of pars plana vitrectomy (PPV) on oxygen saturation in retinal vessels in patients with diabetes and non-diabetes after a 1-year follow-up. METHODS: This was a prospective consecutive interventional case series in 82 eyes in 82 patients. The sample consisted of 25 patients with non-proliferative diabetic retinopathy with macular oedema based on vitreoretinal traction or epiretinal membrane (ERM) and 57 non-diabetic patients with macular hole and ERM...
February 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/26303449/retinal-vessel-oxygen-saturation-and-vessel-diameter-in-high-myopia
#10
Qishan Zheng, Yao Zong, Li Li, Xia Huang, Leilei Lin, Wei Yang, Yongguang Yuan, Yujie Li, Huining He, Qianying Gao
PURPOSE: To investigate changes in retinal vessel oxygen saturation and diameter in high myopia. METHODS: Relative oxygen saturation was measured in the retinal blood vessels of 54 participants with high myopia and compared to a control group of 54 individuals with emmetropia with the Oxymap T1 retinal oximeter. The participants with high myopia were further divided into two groups according to the grade of myopic retinopathy: Group A (grade < M2 ) and Group B (grade ≥ M2 )...
September 2015: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/26042732/retinal-vessel-oxygen-saturation-during-100-oxygen-breathing-in-healthy-individuals
#11
Olof Birna Olafsdottir, Thorunn Scheving Eliasdottir, Jona Valgerdur Kristjansdottir, Sveinn Hakon Hardarson, Einar Stefánsson
PURPOSE: To detect how systemic hyperoxia affects oxygen saturation in retinal arterioles and venules in healthy individuals. METHODS: Retinal vessel oxygen saturation was measured in 30 healthy individuals with a spectrophotometric retinal oximeter (Oxymap T1). Oximetry was performed during breathing of room air, 100% oxygen (10 minutes, 6L/min) and then again room air (10 minutes recovery). RESULTS: Mean oxygen saturation rises modestly in retinal arterioles during 100% oxygen breathing (94...
2015: PloS One
https://www.readbyqxmd.com/read/26024070/retinal-oxygen-saturation-in-retinitis-pigmentosa-and-macular-dystrophies-in-asian-indian-eyes
#12
Rajani Battu, Ashwin Mohan, Anjani Khanna, Abhinav Kumar, Rohit Shetty
PURPOSE: To study the oxygen-saturation profiles in RP and macular dystrophies and compare them with age-matched healthy controls. METHODS: In a cross-sectional prospective study, 62 subjects with RP, 23 with macular dystrophies, and 78 controls were enrolled, and retinal oximetry was performed with the Oxymap T1 retinal oximeter. The images were analyzed for oxygen saturation and diameter of retinal vessels. RESULTS: All parameters showed a significant difference among the three groups...
May 2015: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/25952041/retinal-vessel-oxygen-saturation-and-vessel-diameter-in-retinitis-pigmentosa-at-various-ages
#13
Yao Zong, Leilei Lin, Changxian Yi, Xia Huang, Yue Fu, Yanmin Dong, Xiaobing Qian, Yujie Li, Qianying Gao
PURPOSE: This study was conducted to determine whether oxygen saturation and retinal blood vessel diameter are affected by retinitis pigmentosa (RP) at various ages. METHODS: Relative oxygen saturation was measured in retinal blood vessels in 68 RP patients and 136 normal subjects using the Oxymap T1 retinal oximeter. Subjects were divided into two age groups: Group A (20-40 years) and Group B (> 40 years). One randomly selected eye of each subject was used for statistical analysis...
February 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/25923699/normative-database-of-retinal-oximetry-in-asian-indian-eyes
#14
Ashwin Mohan, Supriya Dabir, Naresh Kumar Yadav, Matthew Kummelil, Rajesh S Kumar, Rohit Shetty
OBJECTIVE: To study the oxygen saturation profile in normal Asian Indian eyes. DESIGN: A cross sectional prospective study. SUBJECTS: Ninety eight consecutive patients presenting to our hospital with best corrected distance visual acuity (BCVA) of 20/20 and a normal ophthalmic examination were included in the study. Patients having any ocular or systemic disease were excluded from the study. MATERIALS AND METHODS: Oximetry was performed on all subjects with the Oxymap T1 retinal oximeter (Oxymap hf, Reykjavik, Iceland)...
2015: PloS One
https://www.readbyqxmd.com/read/25528886/provocative-intraocular-pressure-challenge-preferentially-decreases-venous-oxygen-saturation-despite-no-reduction-in-blood-flow
#15
Rachael A O'Connell, Andrew J Anderson, Sarah L Hosking, Bang V Bui
PURPOSE: Ocular disease can both alter the retina's oxygen requirements, and decrease its ability to cope with changes in metabolic demand. We examined the influence of a moderate intraocular pressure (IOP) elevation on three outcome measures: arterial and venous oxygen saturation, blood flow, and the pattern electroretinogram (PERG). METHODS: We increased IOP to ˜30 mmHg in 23 healthy participants (22-39 years) using a mechanical probe applied to the eyelid, thereby lowering ocular perfusion pressure (OPP) by ~30%...
March 2015: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/25403794/analysis-of-retinal-vessels-in-eyes-with-retinitis-pigmentosa-by-retinal-oximeter
#16
Tomoko Ueda-Consolvo, Chiharu Fuchizawa, Mitsuya Otsuka, Takuya Nakagawa, Atsushi Hayashi
PURPOSE: To study changes in the oxygen saturation and calibre of retinal vessels in the eyes of patients with retinitis pigmentosa (RP). METHOD: In this cross-sectional study, 63 eyes of 63 patients with RP and 14 eyes of 14 healthy subjects were enrolled and examined at Toyama University Hospital. Retinal oximetry measurements were performed using a spectrophotometric oximetry unit (Oxymap T1, Reykjavik, Iceland), which is coupled to a fundus camera base (TRC-50DX; Topcon Corporation, Tokyo, Japan)...
September 2015: Acta Ophthalmologica
https://www.readbyqxmd.com/read/25301879/reliability-and-determinants-of-retinal-vessel-oximetry-measurements-in-healthy-eyes
#17
WanFen Yip, Rosalynn Siantar, Shamira A Perera, Nia Milastuti, Kee Ka Ho, Bernard Tan, Tien Yin Wong, Carol Y Cheung
PURPOSE: To assess the reliability and determinants of retinal vessel oximetry measurements with the Oxymap T1 Retinal Oximeter in normal Asian eyes. METHODS: Subjects older than 40 years without a history of stroke and heart disease were recruited from a community-based clinic. Subjects underwent standardized systemic and ocular examinations. Normal eyes were defined as eyes without major eye diseases such as age-related macular degeneration, glaucoma, or retinopathy...
November 2014: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/25253765/reproducibility-of-retinal-oxygen-saturation-in-normal-and-treated-glaucomatous-eyes
#18
Iman Goharian, Shawn M Iverson, Rosa Catalina Ruiz, Krishna Kishor, David S Greenfield, Mitra Sehi
AIM: To measure the reproducibility of retinal oxygen saturation (SaO2) levels among treated glaucomatous eyes and normal controls in a prospective non-randomised study. METHODS: Patients with perimetric glaucoma (PG) and normal controls were included. Exclusion criteria for both groups included visual acuity <20/30, unreliable visual fields, thyroidopathies, hemoglobinopathies, cardiovascular and pulmonary diseases. Retinal oximetry was performed twice consecutively on one randomly selected eye of PG and normal controls using spectrophotometric retinal oximeter (SRO; Oxymap ehf...
March 2015: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/24825109/retinal-vessel-oxygen-saturation-increases-after-vitrectomy
#19
Laurence Shen Lim, Licia Tan, Shamira Perera
PURPOSE: To evaluate the effects of vitrectomy on retinal vascular oxygen saturation in an adult population. METHODS: This was a prospective observational study. Twenty-seven eyes of 27 patients who underwent vitrectomy for macular conditions were included. Retinal oximetry was performed using the Oxymap system prior to vitrectomy and 3 months after surgery and the mean retinal arterial and venous oxygen saturation were measured. The arterial-venous difference (AVD) was calculated as the difference between the arterial and venous saturations...
June 2014: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/24811846/test-retest-reliability-of-retinal-oxygen-saturation-measurement
#20
Rachael A O'Connell, Andrew J Anderson, Sarah L Hosking, Abrez H Batcha, Bang V Bui
PURPOSE: To determine intrasession and intersession repeatability of retinal vessel oxygen saturation from the Oxymap Retinal Oximeter using a whole image-based analysis technique and so determine optimal analysis parameters to reduce variability. METHODS: Ten fundus oximetry images were acquired through dilated pupils from 18 healthy participants (aged 22 to 38) using the Oxymap Retinal Oximeter T1. A further 10 images were obtained 1 to 2 weeks later from each individual...
June 2014: Optometry and Vision Science: Official Publication of the American Academy of Optometry
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