Myopic Astigmatism as a Substitute for Accommodation in Pseudophakia

2015 ◽  
pp. 17-26 ◽  
Author(s):  
C. Huber
Keyword(s):  
Myopic Astigmatism

The effect of PRK on corneal epithelium thickness and pachmetry in treatment of myopia.

2018 ◽  
Vol 9 (SPL1) ◽  
Author(s):  
Furkaan Majied Hamied ◽  
Deyaa Neama Kadhim ◽  
Sohaib A Mahmood
Keyword(s):  
Refractive Error ◽  
Anterior Segment ◽  
Thickness Change ◽  
Corneal Epithelial ◽  
Epithelial Thickness ◽  
Refractive Outcomes ◽  
Epithelium Thickness ◽  
Profile Changes ◽  
Corneal Epithelial Thickness ◽  
Myopic Astigmatism

In order to facilitate the corneal stromal ablation in photorefractive keratectomy the epithelium is removed so corneal repair associated with changes in epithelium and stroma. To study the corneal epithelial thickness and pachymetry profile changes after photorefractive keratec­tomy (PRK) for myopia. Retrospective analysis of the postoperative corneal epithelial thickness and pachymetry profile changes in 22 eyes of 12 patients treated with PRK for myopia or myopic astigmatism. Corneal and epithelial thickness maps within the central 6 mm were obtained by anterior segment spectral-domain optical coherence tomography (SD-OCT) preop­eratively and at 3 months postoperatively. Correlations between pachymetry,epithelial thickness changes and the amount of correction,were analyzed.Compared to preoperative values,the central 2 mm and the paracentral 2 to 5 mm zone epithelium was 1 ± 2.85 and 1 ± 3.11 μm thicker,respec­tively,at 3 months postoperatively (P <.05). The spheri­cal equivalent (SE) changed from-2.80 ± 2.028 diop­ters (D) preoperatively to -0.40 ± 0.42 D at 3 months postoperatively. Females show greater postoperative epithelial thickening, 2.6 ± 3.77 μm,than males,0.34 ± 1.98 μm. There was a trend toward greater epithelial thickening with a larger amount of programmed SE correction, and thinner preoperative epithelium. No correlation between epithelial thickness change and postoperative change in refraction was detected.Negative correlation between between age, refractive error,with the pre and post-operative pachymetry. In general female pachymetry reading is higher than it in male.The corneal epithelial thickness in­creased after PRK up to 3 months postoperatively. It was affected by the amount of myopia treated, gender, and preoperative epithelial thickness. The refractive outcomes did not affected by the postoperative epithelial thickening. Negative correlation between between age, refractive error, with the pre and post-operative pachymetry. In general female pachymetry reading is higher than it in male.

Femtosecond LASIK for the correction of low and high myopic astigmatism

2021 ◽  
Author(s):  
Rafael Cañones-Zafra ◽  
Andreas Katsanos ◽  
Montserrat Garcia-Gonzalez ◽  
Juan Gros-Otero ◽  
Miguel A. Teus
Keyword(s):  
Myopic Astigmatism ◽  
High Myopic Astigmatism

Photorefractive Keratectomy for Compound Myopic Astigmatism With an Eye Cup Erodible Mask Delivery System

1996 ◽  
Vol 12 (4) ◽  
pp. 501-538 ◽  
Author(s):  
Rosario Brancato ◽  
Francesco Carones ◽  
Elisabetta Venturi ◽  
Alessandro Morico ◽  
Pier Giorgio Gobbi
Keyword(s):  
Delivery System ◽  
Photorefractive Keratectomy ◽  
Myopic Astigmatism

The Effect of Spherical Photorefractive Keratectomy On Myopic Astigmatism

1995 ◽  
Vol 11 (3) ◽  
Author(s):  
Anat Loewenstein ◽  
Isaac Lipshitz ◽  
Florina Lichtenstein ◽  
Ayala Ben-Sirah ◽  
Moshe Lazar
Keyword(s):  
Photorefractive Keratectomy ◽  
Myopic Astigmatism

Corneal topography and classical test in the diagnosis of dry eye syndrome in patients with myopia and myopic astigmatism before keratorefractive surgery

2021 ◽  
pp. 39-43
Author(s):  
Y.V. Kutuzova ◽  
◽  
I.V. Dutchin ◽  
E.L. Sorokin ◽  
◽  
...  
Keyword(s):  
Dry Eye ◽  
Tear Film ◽  
Risk Groups ◽  
Corneal Topography ◽  
Dry Eye Syndrome ◽  
Film Rupture ◽  
Keratorefractive Surgery ◽  
The Stability ◽  
High Degree ◽  
Myopic Astigmatism

Purpose.To conduct a comparative analysis of the effectiveness of assessing the stability of the tear film using corneotopography and the classic Norn test in patients with myopia and myopic astigmatism before keratorefractive surgery. Material and methods. The study included 26 patients planned for keratorefractive surgery for myopia and myopic astigmatism, aged 18 to 47 years. 7 people there was a mild degree of myopia, in 14 people – medium degree, in 5 people – high degree. The average degree of corneal astigmatism was 2.25 diopters. The stability of the pre-corneal tear film was assessed using computed keratotopography and Norn's test – the tear film rupture time (TFRT) was deter- mined. A standard questionnaire was also used to assess the severity of symptoms of dry eye syndrome. A comparison was made of the indicators of the stability of the tear film obtained by the methods of corneotopography and the Norn's test, with their subsequent comparison with the data of the questionnaire. Results. In 17 patients (65.4%), the TFRT index corresponded to the age norm. In the remaining 9 people (34.6%), indicators of stability of the tear film were reduced both by corneotopography (12±4 sec) and by Norn's test (13.5±4.5 sec), and there were also subjective signs of dry eye syndrome according to data questionnaire. The data turned out to be comparable. Conclusions. 1. Among the total population of patients, 34.6% were persons with impaired tear film stability and subjective manifestations of dry eye syndrome. 2. Assessment of the stability of the tear film, determined using the method of corneal topography, showed a high degree of comparability with the results of Norn's test. A significant advantage of the keratotopography method is its non-invasiveness. 3. It is necessary to pay attention to the condition of the ocular surface and identify risk groups to avoid chronicity or aggravation of existing disorders. Key words: dry eye syndrome, tear film, keratotopography, Norn's test.

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