Astigmatism is the most frequent refractive error worldwide followed by hyperopia and myopia. Internal astigmatism has to be differentiated from external astigmatism. Furthermore, external astigmatism can be divided into "with the rule", "against the rule" and "oblique". The summation of internal and external astigmatism results in the refractive cylinder. Astigmatism has for a long time been regarded as a two-dimensional phenomenon; however, only a three-dimensional consideration expanded the view on existing analytical methods (topography and tomography). Alpins' vector analysis is a commonly used method for treatment planning. Multiple options exist for treatment of astigmatism with conservative approaches, such as eyeglasses or toric contact lenses as well as various surgical procedures, such as photorefractive keratectomy, femtosecond laser-assisted keratotomy, laser in-situ keratomileusis, small incision lenticule extraction and toric intraocular lens implantation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s00347-019-0865-7 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Ocular findings in Baraitser-Winter syndrome with a de novo mutation in the ACTG1 gene: a case report.
BMC Ophthalmol
December 2024
Department of Ophthalmology, Daegu catholic university school of medicine, Daegu, Korea.
Background: Baraitser-Winter syndrome (BWS) is rare, and no previous reports have described the visual course of patients with this condition. Herein, we report the long-term visual outcomes and ocular features of a 6-year-old patient diagnosed with BWS.
Case Presentation: A 6-year-old female patient visited our clinic complaining of low vision.
A compact Nd:YVO/Cr:YAG passively Q-switched laser in a near-hemispherical resonator is exploited to realize high-peak-power pulsed beams with high spatial degrees of freedom. Beneficial from the advantages of strong intracavity beam focusing as well as the point-like excitation condition for the proposed cavity design, various high-order structured pulses as coherent superpositions of multiple degenerate eigenmodes are stably generated under different off-axis pump schemes. Besides, by employing external-cavity astigmatic mode conversion (AMC), the oval-shaped and chessboard-like structured pulses under on-axis and 1D off-axis pumping are transformed into exotic modes with polygonal and figure-eight-shaped envelopes to further enrich the spatial complexity of the generated fields.
View Article and Find Full Text PDFPurpose: To compare clinical and topographical outcomes of three different surgical strategies for advanced pellucid marginal degeneration (PMD).
Methods: Retrospective, interventional case series of 8 advanced PMDs undergoing three different surgical interventions: Sliding Keratoplasty (SK), Sliding Keratoplasty with Relaxing Incision (SKRI), Sector Lamellar Keratoplasty (SLK). Pre-operatively and at 1, 3, 6, 12-month and final follow-up (50.
Subjective Refraction Test Using a Smartphone for Vision Screening.
J Vis Exp
October 2024
Schepens Eye Research Institute, Mass Eye & Ear; Department of Ophthalmology, Harvard Medical School.
To improve access to vision care and to enable mass vision screening, a smartphone app has been developed to measure refractive errors. Without needing any external attachment, the app running on a standalone phone can be used by lay personnel to measure subjective refraction. Its validity has been pilot-tested in clinical settings and underserved communities.
View Article and Find Full Text PDFTriple treatment therapy for congenital stromal iris cyst.
Indian J Ophthalmol
November 2024
Cornea and External Disease, Cataract and Refractive, Ocular Oncology and Low Vision Services, All India Institute of Medical Sciences, New Delhi, India.
Article Synopsis
- Iris cysts can cause a range of serious eye issues, so their complete removal is crucial to prevent recurrence and improve patient outcomes.
- A new three-step technique was developed for managing iris cysts, which includes aspiration, wall removal, and cauterization while minimizing tissue damage.
- This minimally invasive approach led to fewer complications, no reported recurrences in six months, and overall better visual outcomes compared to more aggressive treatments.
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!