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共3篇 平均IF=3.1 (3-3.2)更多分析
  • 1. [Relationship between best corrected visual acuity and refraction parameters in myopia].
    作者:Lü Ya-ping , Xia Wen-tao , Chu Ren-yuan , Zhou Xing-tao , Dai Jin-hui , Zhou Hao
    期刊:Fa yi xue za zhi
    日期:2011-04-01
    OBJECTIVE:To explore the relationship between best corrected visual acuity (BCVA) and refraction parameters in myopia. METHODS:Two thousand two hundred and seventy-four patients (4245 eyes) with different degrees of myopia were collected. Their BCVA, diopter of spherical (DS), diopter of cylinder (DC), astigmatism axis, axial length (AL) and corneal thickness were detected. The influence of those parameters on BCVA was studied and the mathematical model of the relationship between BCVA and other parameters including the age and gender of patients was established. RESULTS:The logistic regression analysis showed that there were correlations between the BCVA (y) and DS (x1), DC (x2), gender (x3), AL (x4), corneal thickness (x5), astigmatism axis (x6) and age (x7) (P<0.05): y=0.580 6-0.034 0 x1-0.046 8 x2+0.056 5 x3+0.016 5 x4+ 0.0007 x5+0.000 2 x6-0.005 8 x7. CONCLUSION:For people with myopia, age, gender and corneal thickness have small effect on BCVA, while the DS, DC, AL and astigmatism axis have significant effect on BCVA. The BCVA would decline following the extension of DS, DC and AL. It is helpful to assess the vision of myopia by analyzing the refraction parameters comprehensively.
  • 3区Q1影响因子: 3.2
    2. Association between total astigmatism and myopia.
    作者:Kaye S B , Patterson A
    期刊:Journal of cataract and refractive surgery
    日期:1997-12-01
    PURPOSE:To determine whether there is an association between degree of myopia and total astigmatism. SETTING:St. Paul's Eye Unit, Royal Liverpool University Hospitals, Liverpool, United Kingdom. METHODS:Refractive and keratometric data for 105 eyes of 105 patients with myopia and astigmatism who attended a photorefractive keratectomy (PRK) assessment clinic were analyzed. The refractive data of the patients having PRK were also analyzed before and after treatment. RESULTS:There was a strong correlation between total astigmatism (A) and degree of myopia. This could be represented by a linear regression line in the form A = -0.13 x myopia + 0.86 (at the corneal plane). Although there were trends, there was no significant correlation between the degree of corneal (keratometric) astigmatism and myopia. Data of 35 patients who had PRK were analyzed to determine whether the observed effect on astigmatism could have been predicted from the relationship between myopia and astigmatism. Forty-nine percent of patients with myopia and astigmatism were overcorrected by 0.6 diopter (D) (0.2 to 2.0 D), resulting in a preoperative to postoperative axis shift of 73 degrees; 40% were undercorrected by 1.2 D (0.5 to 3.1 D). Both over- and undercorrections could have been predicted from the relationship between myopia and astigmatism. CONCLUSIONS:The total amount of astigmatism in the myopic eye is proportional to the degree of myopia. The amount that one intends to treat should, therefore, be modified according to the amount of myopia to be treated, as determined by the relationship between the degree of astigmatism and myopia.
  • 2区Q1影响因子: 3
    3. The association between residual astigmatism and refractive errors in a population-based study.
    作者:Hashemi Hassan , Khabazkhoob Mehdi , Peyman Alireza , Miraftab Mohammad , Jafarzadehpur Ebrahim , Emamian Mohammad Hassan , Shariati Mohammad , Fotouhi Akbar
    期刊:Journal of refractive surgery (Thorofare, N.J. : 1995)
    日期:2013-06-27
    DOI :10.3928/1081597X-20130620-01
    PURPOSE:To examine the relationship of spherical equivalent (SE) with refractive, corneal, and residual astigmatism. METHODS:Using stratified cluster sampling, 6,311 individuals were invited and 82.2% participated in this study. Examinations including uncorrected and corrected distance visual acuity tests, refraction, slit-lamp examination, and funduscopy were performed for all participants. Refraction and keratometry were used to calculate refractive and corneal astigmatism, respectively, and their difference was regarded as residual astigmatism. RESULTS:Refractive astigmatism showed a U-shaped relationship with SE; with every diopter (D) increase in astigmatism, the SE increased by 0.230 D in hyperopes and 0.664 D in myopes (P < .001). With every 1.0 D increase in residual astigmatism, the SE showed 0.376 D myopic shift in myopes (P = .004) and 0.077 D hyperopic shift in hyperopes (P = .224). Mean SE was highest among cases of with-the-rule (WTR) astigmatism (P < .001). Cases of high myopia and high hyperopia mostly had WTR and most emmetropes had against-the-rule (ATR) refractive astigmatism. Residual astigmatism was mostly WTR in emmetropic cases; at higher levels of SE error in myopes and hyperopes, WTR residual astigmatism decreased, whereas ATR and oblique residual astigmatism increased. CONCLUSIONS:Increases in SE are associated with higher levels of refractive and residual astigmatism among myopic and hyperopic cases. Unlike refractive astigmatism, WTR residual astigmatism was mostly seen in near emmetropic individuals.
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