Purpose: We aim to improve contact lens fitting by using an innovative and simple photogrammetry imaging system to find the sagittal height (SAG) of soft contact lenses.
Methods: Eleven different types of commercially available soft contact lenses were measured, and five different lenses per package of each lens type were evaluated. The lenses were inserted in a polymethyl methacrylate cell with parallel faces containing a solution of saline and fluorescein to improve the contrast against the background. For every lens, two photographs from the top view and five photographs from the side view were taken. Using homothetic transformations, we calculated the sagittal height.
Results: The SAG of all lenses ranged from 3450 to 3907 μm. Differences can be appreciated between SAG of different materials. Performing an ANOVA test, we confirm that the intra-packaging sagitta is reliable for every lens. Comparing the measured SAG with the calculated spherical one, we confirm that the majority of lenses, eight out of eleven, have a spherical geometry for the internal side. Finally, we are able to group the type of lenses that present similar SAG apart from the data reported on the blister.
Conclusion: Optical coherence tomography measurement of the eye sagitta over a given chord helped finding the first lens to fit, because matching contact lens sagitta and ocular sagitta is the key for a good fitting. In our work, we found that the majority of brands use single sphere geometry for internal surface of disposable soft contact lenses.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s10792-019-01206-5 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Influence of buccal bone lamella defects on hard and soft tissues with submerged and non-submerged healing in immediate implants - an experimental study in minipigs.
Int J Implant Dent
March 2025
Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University at Kiel, Arnold-Heller-Strasse 16, Kiel, Germany.
Purpose: This study assessed the impact of the buccal bone on hard and soft tissues in submerged and non-submerged immediate implants using a minipig model.
Methods: Sixty-five titanium implants (Camlog Progressive Line) were placed in four minipigs immediately after tooth extraction. All non-submerged (NSM) implants received a mechanically induced buccal bone defect (NSM-BD), whereas the submerged group (SM) was classified as defective (SM-BD) and intact (SM-BI).
Molecular Chain Interpenetration-Enabled High Interfacial Compatibility of Ionic and Electronic Conductors for Stretchable Ionic Devices.
Adv Mater
March 2025
Research Institution for Biomimetics and Soft Matter, The Higher Educational Key Laboratory for Biomedical Engineering of Fujian Province, Research Center of Biomedical Engineering of Xiamen, Fujian Key Laboratory of Advanced Materials, Department of Biomaterials, College of Materials, Institute of Flexible Electronics (IFE, Future Technologies), Shenzhen Research Institute of Xiamen University, Xiamen University, Xiamen, 361005, China.
Ionic devices find applications such as flexible electronics and biomedicines and function by exploiting hybrid circuits of mobile ions and electrons. However, the poor interfacial compatibility of hard electronic conductors with soft ionic conductors in ionic devices leads to low deformability, sensitivity, electromechanical responses, and stability. Herein, an interpenetrating interface between silicone-modified polyurethane/carbon nanotube electronic conductors and ionoelastomers in an ionic device using in situ polymerization is fabricated.
View Article and Find Full Text PDFSoft back exosuit controlled by neuro-mechanical modeling provides adaptive assistance while lifting unknown loads and reduces lumbosacral compression forces.
Wearable Technol
February 2025
Department of Biomechanical Engineering, University of Twente, Enschede, The Netherlands.
State-of-the-art controllers for active back exosuits rely on body kinematics and state machines. These controllers do not continuously target the lumbosacral compression forces or adapt to unknown external loads. The use of additional contact or load detection could make such controllers more adaptive; however, it can be impractical for daily use.
View Article and Find Full Text PDFMelioidosis of the Parotid Gland: Lessons Learned from a Fatal Case.
Indian J Otolaryngol Head Neck Surg
January 2025
Department of Microbiology, JIPMER, Puducherry, India.
Meliodosis is an infectious disease also called whitemore's disease that can be fatal and is caused by the bacteria . This facultative intracellular aerobic gram-negative bacterium is typically transmitted through direct contact with contaminated water or soil (Currie et al. in Seminars in Respiratory and Critical Care Medicine 36:111-125, 2015).
View Article and Find Full Text PDFEuropean trends in attitudes and strategies for myopia management in clinical practice.
Cont Lens Anterior Eye
March 2025
College of Health & Life Sciences, Aston University, Birmingham, United Kingdom. Electronic address:
Background: Surveys conducted between 2015 and 2022 showed growing concern among European eye care practitioners about myopia management, though adoption of effective strategies varied. This study updates findings from 2024, analysing trends in attitudes and strategies for myopia management across Europe from 2015 to 2024.
Methods: A cross-sectional online survey targeting European eye care practitioners was distributed in multiple languages through professional bodies.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!