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Astigmatism imaging is a three-dimensional (3D) single molecule fluorescence microscopy approach that yields super-resolved spatial information on a rapid time scale from a single image. It is ideally suited for resolving structures on a sub-micrometer scale and temporal behavior in the millisecond regime. While traditional astigmatism imaging utilizes a cylindrical lens, adaptive optics enables the astigmatism to be tuned for the experiment. We demonstrate here how the precisions in x, y, and z are inter-linked and vary with the astigmatism, z-position, and photon level. This experimentally driven and verified approach provides a guide for astigmatism selection in biological imaging strategies.
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http://dx.doi.org/10.1364/OL.466213 | DOI Listing |
Maedica (Bucur)
June 2025
Ophthalmology Department, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania.
Keratoconus is a bilateral non-inflammatory ectatic disease of the cornea, with an asymmetrical evolution, that occurs in young people during puberty, progressing during the second and third decades and stabilizing around the age of 40. It is characterised by an insidious and progressive thinning of the cornea, myopia and astigmatism, which lead to a decrease in visual acuity. Slit-lamp examination findings in the early stages of keratoconus may appear normal.
View Article and Find Full Text PDFPhotodiagnosis Photodyn Ther
August 2025
Department of Ophthalmology, Peking University International Hospital, Beijing, China. Electronic address:
Background: To compare the visual outcomes and the accuracy of three axial marking techniques for toric intraocular lenses (IOLs): manual marking, the CALLISTO eye image-guided system and femtosecond laser-assisted capsulotomy marking.
Methods: A total of 105 eyes of 105 patients were enrolled in this retrospective comparative study. According to different axial marking methods, patients were assigned to the manual marking group (MM group), CALLISTO Eye image-guided system group (CE group) and femtosecond laser-assisted capsulotomy marking group (CM group).
Clin Ophthalmol
August 2025
Department of Ophthalmology, Penn State College of Medicine, Hershey, PA, USA.
Purpose: To investigate the repeatability of a combined Dual-Scheimpflug placido disc corneal tomographer/topographer (Ziemer Galilei G4) with respect to keratometric indices used to monitor progression of keratoconus (KCN).
Methods: Patients with KCN were prospectively enrolled. For each eye lacking history of corneal surgery, 5 measurements were taken in succession.
Biomed Opt Express
August 2025
Indiana University School of Optometry, Bloomington, Indiana, USA.
We used modeling to investigate the imaging characteristics of two multi-segment spectacle lenses intended to treat myopia progression. Determinations were made for the peripheral field, when the eye looks through the lens center, and for foveal vision, when the eye rotates and looks through the lens surround, including the segments. Power corrections were derived across the field and across the pupil, and image quality was determined through spot diagrams and point-spread functions.
View Article and Find Full Text PDFJ Clin Med
July 2025
2nd Ophthalmology Department, Papageorgiou Hospital, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
Pellucid Marginal Degeneration (PMD) is a rare ectatic corneal disorder characterized by inferior peripheral thinning and significant irregular astigmatism. Despite its clinical similarities to keratoconus, PMD presents unique diagnostic and therapeutic challenges. This review aims to provide a comprehensive update on the pathophysiology, clinical features, diagnostic approaches, and management strategies for PMD, emphasizing the latest advancements in treatment options.
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