Discrete surface defects impact the riding quality and safety of a railway system. However, it is challenge to inspect such in vision system because illumination inequality variation reflection property rail surfaces. This paper puts forward real-time visual inspection (VIS) for discrete defects. VIS first acquires image by acquisition system, then, cuts subimage track extraction algorithm. Subsequently, enhances contrast using local normalization (LN) method, which nonlinear independent. At...

Discrete surface defects are the most common anomalies of rails and they should be carefully inspected. However, it is a challenge to detect such in vision system because illumination inequality variation reflection property rail surfaces. This paper presents an intelligent detection (VDS) for discrete focuses on two key issues VDS: image enhancement automatic thresholding. We propose local Michelson-like contrast (MLC) measure enhance images. MLC-based method nonlinear independent;...

Vision-based automatic railway fastener inspection, instead of manual operation, remains a great challenge. Even though many supervised learning-based methods have been developed, expensive training labels and imbalanced data are the main obstacles to leverage performance inspection task. To tackle problems, we present novel vision-based system (VFIS) which is inspired by few-shot learning. VFIS can automatically collect annotate large number samples using proposed online template...

Abstract To evaluate the repeatability of corneal biomechanical parameters in normal and keratoconus eyes, explore factors that affects repeatability, further assess diagnostic ability new parameters. Seventy-seven eyes 47 patients 77 right subjects were recruited current study. All participants received three repeated measurements with 2 to 5 minutes interval. The interclass correlation coefficient (ICC), Cronbach’ α (RC) evaluated. liner regression analysis was used identify affect linear...

This study aimed to compare the values of new corneal visualization Scheimpflug technology (Corvis ST) parameters in normal, subclinical keratoconus (SKC) and (KC) eyes, evaluate diagnostic ability distinguish SKC KC eyes from normal eyes. One-hundred 100 were included study. Corvis ST containing dynamic response measured by one ophthalmologist. The receiver operating characteristic curve was used parameters. different those control after adjusting for IOP CCT, stiffness parameter at first...

To evaluate the independent and interactive effects of eye rubbing atopy on keratoconus (KC) in central China.A total 330 KC patients controls were recruited case-control study. Eye history recorded through face-to-face interviews. The association between rubbing, atopy, analyzed by logistic regression, odds ratios (OR), relative excess risk due to interaction (RERI), attributable proportion (AP), synergy (S) index, 95% confidence intervals (95% CI) calculated.A 228 (69.09%) had an history,...

In this Inside Story, a student describes his experiences after receiving diagnosis of keratoconus at age 16 years.

Abstract The aim of this study was to evaluate the distribution new Corneal Visualisation Scheimpflug Technology (Corvis ST) parameters in normal, Post-laser situ keratomileusis (LASIK), Post-LASIK keratectasia (KE) and keratoconus (KC) eyes, explore diagnostic ability these distinguishing KE from LASIK eyes. Twenty-three normal 23 eyes KC were recruited study. following Corvis ST measured: Max Inverse Radius, deformation amplitude (DA) Ratio [2 mm], Pachy Slope, DA [1 Ambrosio’s relational...

To evaluate the distribution of pediatric keratoconus patients and disease severity based on different age gender groups in China.A total 446 eyes 266 from January 2019 to 2022 were included cross-sectional study. The clinical findings recorded Kruskal-Wallis test, chi-squared Cochran-Mantel-Haenszel (CMH) test used compare parameters between groups.The male/female ratio was 353/93 (3.8:1), median 16 years (range: 6-17 years). Male statistically younger than female (P = 0.041). decreased...

Purpose . To investigate the effect of preoperative treatment and postoperative enhanced anti-inflammatory on alleviating meibomian gland dysfunction (MGD) dry eye induced by cataract surgery. Design Prospective, randomized clinical trial. Methods A total 120 patients with moderate obstructive-MGD were enrolled 60:30:30 number in cohorts I, II, III, respectively: Cohort I: routine treatment; II: (warming compress, lid hygiene, treatment) III: treatment. Main Outcomes Measures All...

Abstract Background Although body mass index (BMI) and eye rubbing are linked to an increased risk of keratoconus (KC), the interactive effect BMI on KC is largely unknown. This study aimed evaluate independent effects further explore role environmental factors occurrence KC. Methods A total 621 individuals (291 patients 330 control individuals) were enrolled in this hospital‑based Central China after missing data excluded. was calculated as weight kilograms divided by square height meters....

Keratoconus (KC), characterized by progressive corneal protrusion and thinning, is a complex disease influenced the combination of genetic environmental factors. The purpose this study was to explore potential gene‒environment interaction between calpastatin (CAST) gene eye-rubbing in KC.

Abstract China is a populous country but lacks epidemiological data on keratoconus (KC). The present study aimed to investigate the clinical data, demographic and visual function (VF) of KC patients in Central China. A total 524 eyes 307 (217 bilateral 90 unilateral) from Henan Eye Hospital were included current study. Demographic VF assessed with questionnaires administered by well-trained staff during face-to-face interviews. Visual acuity value was examined qualified optometrist, measured...

Purpose: To investigate the eye rubbing habits of Chinese patients with keratoconus. Methods: This study was carried out from 2018 to June 2022 at Shandong Eye Hospital, Qingdao and Henan Hospital. The compared number who rubbed their eyes between medical records second time questionnaires, myopia keratoconus, disease severity A questionnaire survey ophthalmologists conducted determine degree awareness that is a risk factor for Results: assessed 799 keratoconus 798 control patients, 97...

Purpose . To investigate the pachymetry distribution of central cornea and morphologic changes in subclinical keratoconus with normal biomechanics determine their potential benefit for screening very early keratoconus. Methods This retrospective comparative study was performed 33 clinically unaffected eyes topography from patients asymmetric ectasia (VAE-NTB; Corvis Biomechanical Index defined) 70 truly age-matched subjects. Corneal topographic, tomographic, biomechanical metrics were...

Corrugation detection based on computer vision is a rapid and economical inspection technology, it has attracted more attention from railway industry. This paper presents an effective corrugation system that includes on-board image acquisition subsystem identification subsystem. In the subsystem, track captured by first segmented rail localization algorithm weighted projection profile. And then each column of represented local frequency features identified as line or not support vector...

To describe the development of bacterial keratitis after small incision lenticule extraction in 5 patients and to explore its appropriate therapies.We retrospectively summarized clinical treatments five with postoperative infection extraction, who were referred our hospital from 2019 2021.Five male had undergone bilateral SMILE local due myopia aged 18 26 years. The onset during 1-3 days postoperatively four them severe (2 bilateral, 2 unilateral). In cases, 1 patient (1 eye) was infected...

To solidify the involvement of Saa-related pathway in corneal neovascularization (CorNV). The pathogenesis inflammatory CorNV is not fully understood yet, and our previous study implicated that serum amyloid A (Saa) 1 (Saa1) Saa3 were among genes up-regulated upon induction mice.Microarray data obtained during profiling project on analyzed for encoding four SAA family members (Saa1-4), six reported receptors (formyl peptide receptor 2, Tlr2, Tlr4, Cd36, Scarb1, P2rx7) seven matrix...

The study aimed to evaluate the character of corneal stiffness parameter at first applanation (SP-A1) in normal and keratoconus eyes explore association between SP-A1 severity indicators. A total 351 were included current study. Keratoconus was diagnosed according topography map slit-lamp examination. classified mild (steep keratometry (Ks) < 48D), moderate (48 ≤ Ks 55D), severe (Ks ≥ 55D). measured using Corvis ST software. correlation analyses receiver operating characteristic (ROC) curve...