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Condition: Strabismus (squint)

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Total 289 results found since Jan 2013.

Time trends over five decades, and recent geographical variation, in rates of childhood squint surgery in England.
CONCLUSIONS: Squint surgery rates have decreased substantially over time. The current wide geographical variation in rates raises questions about whether this scale of variation is clinically warranted, whether it reflects variation in needs for surgery and patient/parental choice, whether it is a result of inequalities in the availability of ophthalmic services, or whether it results from variation between clinicians in clinical decision making about the likely benefits of squint surgery. PMID: 23575251 [PubMed - in process]
Source: The British Journal of Ophthalmology - May 26, 2013 Category: Opthalmology Authors: Chou MR, Malik AN, Suleman M, Gray M, Yeates D, Goldacre MJ Tags: Br J Ophthalmol Source Type: research

Time trends over five decades, and recent geographical variation, in rates of childhood squint surgery in England
Conclusions Squint surgery rates have decreased substantially over time. The current wide geographical variation in rates raises questions about whether this scale of variation is clinically warranted, whether it reflects variation in needs for surgery and patient/parental choice, whether it is a result of inequalities in the availability of ophthalmic services, or whether it results from variation between clinicians in clinical decision making about the likely benefits of squint surgery.
Source: British Journal of Ophthalmology - May 18, 2013 Category: Opthalmology Authors: Chou, M. R., Malik, A. N. J., Suleman, M., Gray, M., Yeates, D., Goldacre, M. J. Tags: Original articles - Clinical science Source Type: research

Sensors, Vol. 18, Pages 783: A Novel Sidelobe Reduction Algorithm Based on Two-Dimensional Sidelobe Correction Using D-SVA for Squint SAR Images
u Liu Sidelobe reduction is a very primary task for synthetic aperture radar (SAR) images. Various methods have been proposed for broadside SAR, which can suppress the sidelobes effectively while maintaining high image resolution at the same time. Alternatively, squint SAR, especially highly squint SAR, has emerged as an important tool that provides more mobility and flexibility and has become a focus of recent research studies. One of the research challenges for squint SAR is how to resolve the severe range-azimuth coupling of echo signals. Unlike broadside SAR images, the range and azimuth sidelobes of the squint SAR...
Source: Sensors - March 5, 2018 Category: Biotechnology Authors: Min Liu Zhou Li Lu Liu Tags: Article Source Type: research

Automated detection of squint as a sensitive assay of sex-dependent calcitonin gene–related peptide and amylin-induced pain in mice
We developed an automated squint assay using both black C57BL/6J and white CD1 mice to measure the interpalpebral fissure area between the upper and lower eyelids as an objective quantification of pain. The automated software detected a squint response to the commonly used nociceptive stimulus formalin in C57BL/6J mice. After this validation, we used the automated assay to detect a dose-dependent squint response to a migraine trigger, the neuropeptide calcitonin gene–related peptide, including a response in female mice at a dose below detection by the manual grimace scale. Finally, we found that the calcitonin gene–rel...
Source: Pain - July 30, 2022 Category: Anesthesiology Tags: Research Paper Source Type: research

Sensors, Vol. 17, Pages 2568: Generalized Nonlinear Chirp Scaling Algorithm for High-Resolution Highly Squint SAR Imaging
anqing Wu This paper presents a modified approach for high-resolution, highly squint synthetic aperture radar (SAR) data processing. Several nonlinear chirp scaling (NLCS) algorithms have been proposed to solve the azimuth variance of the frequency modulation rates that are caused by the linear range walk correction (LRWC). However, the azimuth depth of focusing (ADOF) is not handled well by these algorithms. The generalized nonlinear chirp scaling (GNLCS) algorithm that is proposed in this paper uses the method of series reverse (MSR) to improve the ADOF and focusing precision. It also introduces a high order processi...
Source: Sensors - November 7, 2017 Category: Biotechnology Authors: Tianzhu Yi Zhihua He Feng He Zhen Dong Manqing Wu Tags: Article Source Type: research

Sensors, Vol. 19, Pages 213: Extended Multiple Aperture Mapdrift-Based Doppler Parameter Estimation and Compensation for Very-High-Squint Airborne SAR Imaging
Tao Zeng Doppler parameter estimation and compensation (DPEC) is an important technique for airborne SAR imaging due to the unpredictable disturbance of real aircraft trajectory. Traditional DPEC methods can be only applied for broadside, small- or medium-squint geometries, as they at most consider the spatial variance of the second-order Doppler phase. To implement the DPEC in very-high-squint geometries, we propose an extended multiple aperture mapdrift (EMAM) method in this paper for better accuracy. This advantage is achieved by further estimating and compensating the spatial variation of the third-order Doppler p...
Source: Sensors - January 8, 2019 Category: Biotechnology Authors: Zhichao Zhou Yinghe Li Yan Wang Linghao Li Tao Zeng Tags: Article Source Type: research

Keratopigmentation combined with strabismus surgery to restore cosmesis in eyes with disabling corneal scarring and squint.
CONCLUSION: Corneal KTPG combined with strabismus surgery provides good cosmesis for patients with corneal scarring and strabismus with minimal complications. Reoperation rates are relatively high in the short term to accomplish an optimal cosmetic result. PMID: 31527061 [PubMed - as supplied by publisher]
Source: The British Journal of Ophthalmology - September 15, 2019 Category: Opthalmology Authors: Balgos JD, Amesty MA, Rodriguez AE, Al-Shymali O, Abumustafa S, Alio JL Tags: Br J Ophthalmol Source Type: research

Beam Squint and Channel Estimation for Wideband mmWave Massive MIMO-OFDM Systems
With the increasing scale of antenna arrays in wideband millimeter-wave (mmWave) communications, the physical propagation delays of electromagnetic waves traveling across the whole array will become large and comparable to the time-domain sample period, which is known as the spatial-wideband effect. In this case, different subcarriers in an orthogonal frequency division multiplexing (OFDM) system will “see” distinct angles of arrival (AoAs) for the same path. This effect is known as beam squint, resulting from the spatial-wideband effect, and makes the approaches based on the conventional multiple-input multi...
Source: IEEE Transactions on Signal Processing - December 1, 2001 Category: Biomedical Engineering Source Type: research

A randomised comparison of lidocaine 2% gel and proparacaine 0.5% eye drops in paediatric squint surgery
Summary We conducted a randomised trial comparing lidocaine 2% gel with proparacaine 0.5% eye drops in children having elective squint surgery. One hundred and forty children aged between 3 and 14 years were recruited. The requirement for intra‐operative fentanyl and postoperative ibuprofen was significantly less in the lidocaine group compared with the proparacaine group (1 (1.7%) vs 12 (18.5%), p = 0.002 and 16 (27.6%) 38 (58.5%), p = 0.001, respectively). The incidence of postoperative nausea and vomiting was significantly less in the lidocaine group compared with the proparacaine group (6 (10.3%) vs 16 (24.6%), p...
Source: Anaesthesia - June 13, 2013 Category: Anesthesiology Authors: R. Sinha, Chandralekha, M. Batra, B. R. Ray, V. K. Mohan, R. Saxena Tags: Original Article Source Type: research

Sensors, Vol. 16, Pages 873: GMTI for Squint Looking XTI-SAR with Rotatable Forward-Looking Array
To realize ground moving target indication (GMTI) for a forward-looking array, we propose a novel synthetic aperture radar (SAR) system, called rotatable cross-track interferometry SAR (Ro-XTI-SAR), for squint-looking application in this paper. By changing the angle of the cross-track baseline, the interferometry phase component of squint-looking Ro-XTI-SAR caused by the terrain height can be approximately adjusted to zero, and then the interferometry phase of Ro-XTI-SAR is only sensitive to targets’ motion and can be equivalent to the along track interferometry SAR (ATI-SAR). Furthermore, the conventional displaced phas...
Source: Sensors - June 13, 2016 Category: Biotechnology Authors: Kai JingJia XuZuzhen HuangDi YaoTeng Long Tags: Article Source Type: research

A Block Sparsity Based Estimator for mmWave Massive MIMO Channels With Beam Squint
Multiple-input multiple-output (MIMO) millimeter wave (mmWave) communication is a key technology for next generation wireless networks. One of the consequences of utilizing a large number of antennas with an increased bandwidth is that array steering vectors vary among different subcarriers. Due to this effect, known as beam squint, the conventional channel model is no longer applicable for mmWave massive MIMO systems. In this paper, we study channel estimation under the resulting non-standard model. To that aim, we first analyze the beam squint effect from an array signal processing perspective, resulting in a model which...
Source: IEEE Transactions on Signal Processing - December 17, 2019 Category: Biomedical Engineering Source Type: research

Sensors, Vol. 22, Pages 9328: Azimuth Full-Aperture Processing of Spaceborne Squint SAR Data with Blocking Varying PRF
Yaolong Qi The block varying pulse repetition frequency (BV-PRF) scheme applied to spaceborne squint sliding-spotlight synthetic aperture radar (SAR) can resolve large-range cell migration (RCM) and reduce azimuth signal non-uniformity. However, in the BV-PRF scheme, different raw data blocks have different PRFs, and the raw data in each block are insufficiently sampled. To resolve the two problems, a novel azimuth full-aperture pre-processing method is proposed to handle the SAR raw data formed by the BV-PRF scheme. The key point of the approach is the resampling of block data with different PRFs and the continuous s...
Source: Sensors - November 30, 2022 Category: Biotechnology Authors: Zhuo Zhang Wei Xu Pingping Huang Weixian Tan Zhiqi Gao Yaolong Qi Tags: Article Source Type: research

Rates Of Childhood Squint Surgery Have Plummeted Over Past 50 Years
But there's still inexplicable fivefold difference in rates across England, similar to wide discrepancies in tonsil removal Rates of surgery to correct childhood squint in England have tumbled over the past 50 years, finds research published online in the British Journal of Ophthalmology. But there's still a fivefold difference between the areas with the lowest and highest rates of the procedure, similar to the wide variations in tonsil removal, and it's not clear why, say the authors...
Source: Health News from Medical News Today - April 11, 2013 Category: Consumer Health News Tags: Eye Health / Blindness Source Type: news

Treating little Lady Louise Windsor's squint has combated risk to her sight
Although there are many options for treating a squint, an operation shouldn’t be shied away from as it is not just cosmetic, writes DR ELLIE CANNON.
Source: the Mail online | Health - January 18, 2014 Category: Consumer Health News Source Type: news

Sensors, Vol. 15, Pages 3750-3765: Modified Omega-k Algorithm for High-Speed Platform Highly-Squint Staggered SAR Based on Azimuth Non-Uniform Interpolation
In this work, the staggered SAR technique is employed for high-speed platform highly-squint SAR by varying the pulse repetition interval (PRI) as a linear function of range-walk. To focus the staggered SAR data more efficiently, a low-complexity modified Omega-k algorithm is proposed based on a novel method for optimal azimuth non-uniform interpolation, avoiding zero padding in range direction for recovering range cell migration (RCM) and saving in both data storage and computational load. An approximate model on continuous PRI variation with respect to sliding receive-window is employed in the proposed algorithm, leaving ...
Source: Sensors - February 5, 2015 Category: Biotechnology Authors: Hong-Cheng ZengJie ChenWei LiuWei Yang Tags: Article Source Type: research