myopic astigmatism

Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to myopic astigmatism: hyperopic astigmatism


an error of refraction in which a ray of light is not sharply focused on the retina, but is spread over a more or less diffuse area; it is due to differences in curvature in the refractive surfaces (cornea and lens) of the eye. adj., adj astigmat´ic. Its exact cause is not known; some common types of astigmatism seem to run in families and may be inherited. Probably everyone has some astigmatism, since it is rare to find perfectly shaped curves in the cornea and lens, but the defect is rarely serious. If the refractive error is troublesome, corrective lenses may be needed.
compound astigmatism that in which both principal meridians are either hyperopic (compound hyperopic astigmatism, with rays coming into focus behind the retina) or myopic (compound myopic astigmatism, with rays coming into focus in front of the retina).
corneal astigmatism that due to the presence of abnormal curvatures on the anterior or posterior surface of the cornea.
hypermetropic astigmatism hyperopic astigmatism.
hyperopic astigmatism that in which the light rays are brought to a focus behind the retina.
irregular astigmatism that in which the curvature varies in different parts of the same meridian or in which refraction in successive meridians differs irregularly.
lenticular astigmatism astigmatism due to defect of the crystalline lens.
mixed astigmatism that in which one principal meridian is hyperopic and the other myopic.
myopic astigmatism that in which the light rays are brought to a focus in front of the retina.
regular astigmatism that in which the refraction changes gradually in power from one principal meridian of the eye to the other, the two meridians always being at right angles; this condition is further classified as being against the rule when the meridian of greatest refractive power tends toward the horizontal, with the rule when it tends toward the vertical, and oblique when it lies 45 degrees from the horizontal and vertical.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

my·o·pic a·stig·ma·tism

that form of astigmatism in which one meridian is myopic and the one at right angle to it is without refractive error.
Farlex Partner Medical Dictionary © Farlex 2012

my·o·pic a·stig·ma·tism

(mī-op'ik ă-stig'mă-tizm)
An astigmatism in which both meridians are myopic.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
In summary, our results supports the view that LASIK offered outcomes with good safety standards in the correction of myopia and myopic astigmatism throughout the 12-year observation period.
Myopia, was found to be the most frequent refractive error in young adults (43.33%), followed by myopic astigmatism (30%), hypermetropia (15%), hypermetropic astigmatism (5%), and mixed astigmatism in (6.67%).
Early reports of SMILE have confirmed its safety and efficacy in surgical treatment of myopia and myopic astigmatism [1, 4-10].
Kubaloglu et al., "Toric implantable collamer lens for moderate to high myopic astigmatism: 3-year follow-up," Graefe's Archive for Clinical and Experimental Ophthalmology, vol.
* Management indicated in narrow Palpebral fissure is levator muscle Resection and spectacles for high myopic Astigmatism. Carbamazepine leads to Improvement of symptoms.
A 39-year-old woman underwent successful Wavelight femtosecond LASIK in each eye for treatment of compound myopic astigmatism in both eyes.
Wavetront-optimized vetsus waveftont-guided LAS1K for myopic astigmatism with the ALLEGRETTO WAVE: three-month results of a prospective FDA trial.
Kremer, "Wavefront-supported photorefractive keratectomy with the Bausch & Lomb Zyoptix in patients with myopic astigmatism and suspected keratoconus," Journal of Refractive Surgery, vol.
(4.) Kohnen T, Buhren J Wavefront-guided LASIK with the Zyoptix 3.1 system for the correction of myopia and compound myopic astigmatism with 1-year follow-up: clinical outcome and change in higher order aberrations.
We retrospectively studied the medical records of 29 eyes of 29 patients (15 females and 14 males) who had undergone LASIK for the treatment of myopia and/or myopic astigmatism at the Asya Eye Medical Centre between June 2017 and May 2018.
Kobashi, "Long-term comparison of posterior chamber phakic intraocular lens with and without a central hole (hole ICL and conventional ICL) implantation for moderate to high myopia and myopic astigmatism: consort-compliant article," Medicine, vol.