2022年5月1日 · Fairly uncommon, clinically relevant irregular astigmatism is not always front of mind for clinicians. Experts discuss when to suspect it, how to diagnose it, and nonsurgical and surgical approaches t

2020年4月20日 · Irregular astigmatism: nonuniform steepening that cannot be corrected by cylindrical lens (BCVA of 20/50 or worse due to irregular astigmatism). Expected topography: steep and flat axes less or more than 90 degrees apart

The diagnosis of irregular astigmatism can be suspected when there is loss of spectacle corrected visual acuity but preservation of vision through pinhole or while wearing rigid gas-permeable contact lenses. Other clues for the presence of irregular astigmatism are

Fairly uncommon, clinically relevant irregular astigmatism produces a curvature at each merid-ian that is not uniform. “Irregular astigmatism is not correctable with standard spectacles or contacts, but the degree of vision loss varies by how irregular and high the astigmatism is,” said Michael W. Belin, MD, at the University of Arizona

2024年11月4日 · Irregular astigmatism can be caused by eye injuries, surgeries, or conditions like keratoconus, and may result in more severe vision problems. Treatment for irregular astigmatism may involve specialty contact lenses, corneal reshaping, or surgical procedures to improve vision.

2013年6月1日 · Corneal topography and corneal tomography often provide the best overall assessment of the corneal status and degree of astigmatism, irregularity and symmetry. These platforms can also help in determining the central corneal power to be used in IOL calculations.

In some of these cases, a large axis difference could have incurred corneal higher order aberrations resulting in irregular astigmatism. ... Tsiklis NS, Hajitanasis GC, M Aslanides I, G Pallikaris I. Topography-guided treatment of irregular astigmatism with the wavelight excimer laser. J Refract Surg. 2006;22(4):335–344. doi: ...

5 天之前 · The Sirius three-dimensional corneal topography system was utilised to ascertain the mean corneal thickness of the meridians. ... The extent of residual astigmatism is influenced by this thickness ...

4 天之前 · Purpose To compare keratometric astigmatism (ΔK) and total corneal astigmatism (ΔTK) calculated by the IOLMaster 700 in cataract cases with regular corneal astigmatism ≥ 0.75 diopters (D). Methods This study was a secondary analysis of a database of cataract patients who had undergone examination with IOLMaster 700 between May 2021 and March 2022 at Shanghai Eye Disease Prevention and ...

With astigmatism, the eye is egg- or oval-shaped like a North American football. There are two basic types of astigmatism: horizontal astigmatism (when the eye is wider than it is tall) vertical astigmatism (when the eye is taller than it is wide) With either type of astigmatism, near and far vision is blurry because of the eye’s irregular shape.