Relationship between objective and subjective refraction measurements in patients with mild keratoconus  

作　　者：Masoud Khorrami-Nejad Ahmed Kamil Dakhil Hesam Hashemian Masoud Sadeghi Reza Yousefi Foroozan Narooie-Noori 

机构地区：[1]Optometry Department,School of Rehabilitation,Tehran University of Medical Sciences,Tehran 1148965111,Iran [2]Optical Techniques Department,College of Health and Medical Techniques,Al-Mustaqbal University,Babylon 51001,Iraq [3]Translational Ophthalmology Research Center,Farabi Eye Hospital,Tehran University of Medical Sciences,Tehran 1336616351,Iran

出　　处：《International Journal of Ophthalmology(English edition)》2025年第3期398-403,共6页国际眼科杂志(英文版)

摘　　要：AIM:To compare objective dry retinoscopy and subjective refraction measurements in patients with mild keratoconus(KCN)and quantify any differences.METHODS:This cross-sectional study was done on 68 eyes of 68 patients diagnosed with mild KCN.Objective dry retinoscopy using autorefractometer and subjective refraction measurements were performed.Sphere,cylinder,J0,J45,and spherical equivalent values were compared between the two techniques.RESULTS:The mean age of 68 patients with mild KCN was 21.32±5.03y(12–35y).There were 37(54.4%)males.Objective refraction yielded significantly more myopic sphere(-1.44 D vs-0.57 D),higher cylinder magnitude(-2.24 D vs-1.48 D),and more myopic spherical equivalent(-2.56 D vs-1.31 D)compared to subjective refraction(all P<0.05).The mean differences were-0.87 D for sphere,-0.76 D for cylinder,and-1.25 D for spherical equivalent.No significant differences were found for J0 and J45 values,indicating agreement in astigmatism axis(P>0.05).CONCLUSION:In patients with mild KCN,objective dry retinoscopy overestimates the degree of myopia and astigmatism compared to subjective refraction.The irregular cornea in KCN likely impacts objective measurements.Subjective refraction allows compensation for irregularity,providing a more accurate correction.When determining refractive targets,the tendency of objective methods to overcorrect should be considered.

关 键 词：KERATOCONUS objective refraction subjective refraction 

分 类 号：R73[医药卫生—肿瘤]