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      The differences of corneal astigmatism in different populations and its quantitative analysis


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          To analyze the differences of corneal astigmatism in different age groups.


          The clinical data of the patients from the outpatient Department of Ophthalmology of the Tengzhou Central People's Hospital from April 2014 to June 2014 was screened and statistically analyzed. The corneal curvature was measured by three different instruments: Keratometer, IOL Master and Sirius corneal topography. The changes of the corneal astigmatism in different groups were evalutaed in the study.


          Corneal astigmatism of different groups showed no statistical difference and the average corneal astigmatism of 70˜79 age group were higher than younger groups. As the age grew, the with-the-rule astigmatism gradually reduced from 85.8% ( A Group) to 31.0% (F Group). The against-the-rule astigmatism increased from 6.7% ( A Group ) to 45.0% (F Group).


          The proportion of the with-the-rule astigmatism gradually reduced with the growth of age. The proportion of the against-the-rule astigmatism increased significantly. The oblique astigmatism had no obvious change before the age of 40. The proportion of oblique astigmatism increased obviously at the 40˜49 group and tended to be stable. After the age of 60, the proportion of different types of astigmatism tended to be stable.

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          Most cited references21

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          Astigmatism and the development of myopia in children.

          While it is now established that astigmatism is more prevalent in infants and young children than in the adult population, little is known about the functional significance of this astigmatism, especially its role, if any, in emmetropization and the development of myopia. Manifest refractions (mean of 16 per subject) were obtained from 245 subjects starting in the first year, with 6-23 years of regular follow-up. Results showed that infantile astigmatism is associated with increased astigmatism and myopia during the school years. Two possible mechanisms underlying this association are discussed: (1) infantile astigmatism disrupts focusing mechanisms; and (2) ocular growth induces astigmatism and myopia.
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            Is Open Access

            IOL Power Calculation after Corneal Refractive Surgery

            Purpose. To describe the different formulas that try to overcome the problem of calculating the intraocular lens (IOL) power in patients that underwent corneal refractive surgery (CRS). Methods. A Pubmed literature search review of all published articles, on keyword associated with IOL power calculation and corneal refractive surgery, as well as the reference lists of retrieved articles, was performed. Results. A total of 33 peer reviewed articles dealing with methods that try to overcome the problem of calculating the IOL power in patients that underwent CRS were found. According to the information needed to try to overcome this problem, the methods were divided in two main categories: 18 methods were based on the knowledge of the patient clinical history and 15 methods that do not require such knowledge. The first group was further divided into five subgroups based on the parameters needed to make such calculation. Conclusion. In the light of our findings, to avoid postoperative nasty surprises, we suggest using only those methods that have shown good results in a large number of patients, possibly by averaging the results obtained with these methods.
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              Age-related changes in with-the-rule and oblique corneal astigmatism


                Author and article information

                Afr Health Sci
                Afr Health Sci
                African Health Sciences
                Makerere Medical School (Kampala, Uganda )
                June 2020
                : 20
                : 2
                : 775-778
                [1. ] Departement of Ophthalmology, Tengzhou Central People's Hospital, Tengzhou, Shandong, 277500PR China.
                [2. ] Departement of Anesthesiology,TengZhou Central People's Hospital, Teng Zhou, Shandong,277500, PR China.
                Author notes
                Corresponding author: Yanzhen Yang, Address: No. 181 Xingtan Road, Departement of Ophthalmology, TengZhou Central People's Hospital, Teng Zhou, Shandong,277500, PR China Tel/Fax:+86-0632-5512227 Email: yang_yanzhen321@ 123456163.com
                © 2020 Zhang Y et al.

                Licensee African Health Sciences. This is an Open Access article distributed under the terms of the Creative commons Attribution License ( https://creativecommons.org/licenses/BY/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


                with-the-rule astigmatism,against-the-rule astigmatism,oblique astigmatism


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